Correspondence Explorer

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Showing 395 letters from 1831–1870

143 letters from John Frederick William Herschel; 252 letters from Augustus de Morgan

John Frederick William Herschel

Mathematician and astronomer

Born: 07 March 1792

Died: 11 May 1871

Elected to the Royal Society Fellowship: 27/05/1813

View all items sent or received by John Frederick William Herschel
Augustus de Morgan

British mathematician

Born: 1806

Died: 1871

View all items sent or received by Augustus de Morgan

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John Frederick William Herschel

Augustus de Morgan

Mary Somerville publishes Mechanism of the Heavens

1831

Sir John Herschel is created Knight of the Royal Hanoverian Guelphic Order

1831

Sir John Herschel publishes Preliminary Discourse on the Study of Natural Philosophy as part of Dionysius Lardner’s Cabinet Cyclopaedia.

1831

Birth of Isabella Herschel, daughter of John Frederick William Herschel and Margaret Brodie Stewart

5 June 1831

Autograph letter signed by sender. His paper on double stars is required for press so would be grateful if it could be sent along. The society is short of papers for reading so any John Frederick William Herschel can produce would be very welcome.

10 October 1831 Sender: Augustus de Morgan Reference number: HS/6/174

Autograph letter signed by sender. Encloses the proof of the first part of his paper, with queries. Regarding the seal used. Volume of the memoirs have been published. There are important matters for the next Astronomical Council.

2 November 1831 Sender: Augustus de Morgan Reference number: HS/6/175

Copy of letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. Requests the return of his manuscript paper on double stars so that he may prepare his presentation to the next meeting of the Astronomical Society.

25 February 1831 Sender: John Frederick William Herschel Reference number: HS/25/1/25

1832

Autograph letter signed by sender. Returns his paper and would be glad to receive an abstract. John Frederick William Herschel has been removed from the Council of the Royal Astronomical Society in deference to his wishes. King of Denmark has offered a gold medal for the discovery of a comet.

14 January 1832 Sender: Augustus de Morgan Reference number: HS/6/176

Autograph letter signed by sender. Has sent off his observations by the coach. Account of the Oxford meeting is in Tilloch's Magazine, now amalgamated with David Brewster's Edinburgh Journal. Will be able to include the new catalogue of stars in the forthcoming volume if John Frederick William Herschel desires it.

18 July 1832 Sender: Augustus de Morgan Reference number: HS/6/177

Autograph letter signed by sender. Hopes to have John Frederick William Herschel's catalogue for the first meeting of the Royal Astronomical Society Anything about the comet would be welcome. Regarding one of Franciscus Vièta's mathematical theories.

2 October 1832 Sender: Augustus de Morgan Reference number: HS/6/178

Autograph letter signed by sender. Has received the catalogue and it will be sent to the press. Is grateful for John Frederick William Herschel's offers. Does he know anything of Bullialdi's (Ismael Boulliau) Astronomica philolaica? Refers to Franciscus Vièta's Harmonicum coeleste. 25 copies of John Frederick William Herschel's latest paper has been forwarded.

16 October 1832 Sender: Augustus de Morgan Reference number: HS/6/179

Copy of letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. Returns manuscript and corrected proofs of one of John Frederick William Herschel's papers on double stars, with the rest of the paper going to Francis Baily.

1832? Sender: John Frederick William Herschel Reference number: HS/25/14/6

1833

Sir John Herschel receives the Royal Medal from the Royal Society

1833: The Medal is awarded "For his paper on nebulae and clusters of stars, published in the Philosophical Transactions for 1833."

Sir John Herschel publishes A treatise on astronomy as part of Dionysius Lardner’s Cabinet Cyclopaedia.

1833

Birth of William James Herschel, son of John Frederick William Herschel and Margaret Brodie Stewart

1833

Sir John Herschel departs for South Africa with his wife and their three children

13 November 1833

Autograph letter signed by sender. Thanks for his paper on nebulae. Scarlet fever has been very prevalent this season. Royal Society [of London] in financial straits. Paper on John Flamsteed has caused friction between James Ivory and the Royal Astronomical Society Government has promised financial aid to Edinburgh Observatory.

27 December 1833 Sender: Augustus de Morgan Reference number: HS/6/180

Copy of a letter. Arrangements related to John Frederick William Herschel's going to the Cape.

10 October 1833 Sender: John Frederick William Herschel Reference number: HS/21/149

1834

Birth of Margaret Louisa Herschel, daughter of John Frederick William Herschel and Margaret Brodie Stewart

1834

Autograph letter signed by sender. Sending a letter by Francis Baily. Anniversary of the Royal Astronomical Society takes place on Friday. Capt. [Walter?] Forman has had a rise in the world. Observations of Henry Foster fills volume VII of the memoirs.

14 February 1834 Sender: Augustus de Morgan Reference number: HS/6/181

1835

Sir John Herschel serves as President of the Literary and Philosophical Society of the Cape of Good Hope

1835

Halley’s comet becomes visible

28 November 1835

1836

Birth of Alexander Stewart Herschel, son of John Frederick William Herschel and Margaret Brodie Stewart

5 February 1836

Autograph letter signed by sender. Sending him the Calculus of Functions, which he may retain, and also some maps of the stars published by Society for the Diffusion of Useful Knowledge. The Royal Astronomical Society is preparing a picture of Francis Baily and has added John Frederick William Herschel's name to the subscription list. Supposes he has fixed a date for his return. Regarding 'Warren's jet blacking.'

10 July 1836 Sender: Augustus de Morgan Reference number: HS/6/182

Copy of letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. Comments about Augustus De Morgan's work in mathematical functions, and then refers to John Frederick William Herschel's reductions and other astronomical matters, including the need for reform of stellar nomenclature.

30 November 1836 Sender: John Frederick William Herschel Reference number: HS/25/5/4

1837

Victoria becomes Queen of the United Kingdom

20 June 1837

Birth of John Herschel, son of John Frederick William Herschel and Margaret Brodie Stewart

29 October 1837

Autograph letter signed by sender. Will be a great reception for John Frederick William Herschel when he returns. Is working on a theory of probabilities. Francis Baily is the man for mapping the entire heavens. G. B. Airy is to test John Frederick William Herschel's topsy-turvy observations of Orion.

20 February 1837 Sender: Augustus de Morgan Reference number: HS/6/183

1838

Sir John Herschel returns from South Africa

1838: A banquet in presence of Queen Victoria is given to celebrate his return to Britain and made a Baronet.

1839

Sir John Herschel serves his first term as President of the Royal Astronomical Society

1839: to 1841

Birth of Maria Sophia Herschel, daughter of John Frederick William Herschel and Margaret Brodie Stewart

1839

William Henry Fox Talbot presents his paper-based photographic process at the Royal Society

1839

1840

Sir John Herschel publishes in the Philosophical Transactions

1840: Sir John Herschel publishes “On the chemical action of the rays of the solar spectrum on preparations of silver and other substances, both metallic and non-metallic; and on some photographic processes”

Autograph letter signed by sender. Possible to purchase 12 postage covers for 11d in the Strand. Points out an apparent error in one of John Frederick William Herschel's books on sound. How does an open pipe vibrate? Regarding the private character of J. L. Lagrange.

5 June 1840 Sender: Augustus de Morgan Reference number: HS/6/184

Copy of a letter. Thanks Augustus De Morgan for a correction in one of John Frederick William Herschel's writings; tries to explain the partial echo that occurs when blowing across the end of an open pipe.

26 June 1840 Sender: John Frederick William Herschel Reference number: HS/22/55

1841

Sir Robert Peel becomes Prime Minister

1841

Birth of Amelia Herschel, daughter of John Frederick William Herschel and Margaret Brodie Stewart

1841

Autograph letter signed by sender. Regarding John Frederick William Herschel's telescope. Includes a rhyme on it.

9 February 1841 Sender: Augustus de Morgan Reference number: HS/6/185

Autograph letter signed by sender. Points out an error John Frederick William Herschel has made concerning J. E. Bode's law. What is the proper notation for the satellites?

10 October 1841 Sender: Augustus de Morgan Reference number: HS/6/186

Copy of a letter. Thanks Augustus De Morgan for his theorems; comments on the value of such abstract speculations.

31 May 1841 Sender: John Frederick William Herschel Reference number: HS/22/86

1842

Birth of Julia Herschel, daughter of John Frederick William Herschel and Margaret Brodie Stewart

1842

Sir John Herschel publishes in the Philosophical Transactions

1842: Sir John Herschel publishes “On the action of the rays of the solar spectrum on vegetable colours, and on some new photographic processes”

Autograph letter signed by sender. Thanks for the gift of the book. Thomas Longman is now the editor of Lardner's Cyclopaedia. Latitude of the pole star incorrect in Charles Knight's publications. Regarding truth.

22 November 1842 Sender: Augustus de Morgan Reference number: HS/6/187

Autograph letter signed by sender. Thanks for his reductions of Schiller's observations. Many people believe the claims made in the 'Moon Hoax'. Is writing a book on the use of the globes.

30 December 1842 Sender: Augustus de Morgan Reference number: HS/6/188

Copy of a letter. Thanks Augustus De Morgan for the corrections to John Frederick William Herschel's writing on astronomy; congratulates Augustus De Morgan on his book on differential calculus.

17 November 1842 Sender: John Frederick William Herschel Reference number: HS/22/142

1843

Autograph letter signed by sender. Sending two formulae.

25 December 1843 Sender: Augustus de Morgan Reference number: HS/6/189

1844

Birth of Matilda Rose Herschel, daughter of John Frederick William Herschel and Margaret Brodie Stewart

1844

Autograph letter signed by sender. Regarding the workings of Insurance Companies and Benefit Societies. Recommends an actuary. Hopes John Frederick William Herschel will come down for the Anniversary meeting.

30 January 1844 Sender: Augustus de Morgan Reference number: HS/6/190

Autograph letter signed by sender. Has just had a tract on Friendly Societies from J. W. Woolgar. Answers some queries regarding the work of such societies.

6 February 1844 Sender: Augustus de Morgan Reference number: HS/6/191

Autograph letter signed by sender. All the tables in Charles Ansell's work are expressed in decimals. Gives advice on type of insurance for sickness and death. Regarding the true inventor of J. E. Bode's law. Very few at the Anniversary dinner.

10 February 1844 Sender: Augustus de Morgan Reference number: HS/6/192

Autograph letter signed by sender. Advice on how to start a Friendly Society. Calculated the sun's pull on the Earth.

March 1844 Sender: Augustus de Morgan Reference number: HS/6/193

Autograph letter signed by sender. Is working on tables A and B. Further regarding Charles Ansell's life tables.

8 March 1844 Sender: Augustus de Morgan Reference number: HS/6/194

Autograph letter signed by sender. Sending more [life] tables. No age 65 in Charles Ansell's tables. Gives further advice on the running and financing of Friendly Societies.

24 March 1844 Sender: Augustus de Morgan Reference number: HS/6/195

Autograph letter signed by sender. Further regarding life tables and their workings. Francis Baily has a sheet of his grand catalogue on hand.

25 March 1844 Sender: Augustus de Morgan Reference number: HS/6/196

Autograph letter signed by sender. Just dispatched the letter when John Frederick William Herschel's arrived. Regarding benefit societies and their workings. Will write to J. W. Woolgar.

25 March 1844 Sender: Augustus de Morgan Reference number: HS/6/197

Autograph letter signed by sender. Has just received his letter. Further advice on Friendly Societies.

25 March 1844 Sender: Augustus de Morgan Reference number: HS/6/198

Autograph letter signed by sender. Has already sent him [William?] Tidd's tables as he requested. Regarding the printing by 5th April. Has sent tables to Farley.

26 March 1844 Sender: Augustus de Morgan Reference number: HS/6/199

Autograph letter signed by sender. Their Tidd Pratt tables crossed. Comments on Charles Ansell's and J. T. Pratt's tables.

26 March 1844 Sender: Augustus de Morgan Reference number: HS/6/200

Autograph letter signed by sender. Is sending all the tables to the printer tomorrow. Has given tables A and B a heading. J. T. Pratt's table is similar to his own though not accurate in decimals to the pound.

28 March 1844 Sender: Augustus de Morgan Reference number: HS/6/201

Autograph letter signed by sender. Printer unable to send proof to Richard Farley so John Frederick William Herschel will not be able to have proof by the 5th. Has requested printer to forward proof to John Frederick William Herschel.

30 March 1844 Sender: Augustus de Morgan Reference number: HS/6/202

Autograph letter signed by sender. Hopes Richard Farley's proof was in order. Gives details of steel pens he uses. Picture he sends is by W. H. Smyth. Is moving to new address.

8 April 1844 Sender: Augustus de Morgan Reference number: HS/6/203

Autograph letter signed by sender. Send money for Richard Farley to the Nautical Almanac Office. Has just moved house and is in the process of moving thousands of books.

30 April 1844 Sender: Augustus de Morgan Reference number: HS/6/204

Autograph letter signed by sender. Thanks for book. Has written three books on the foundation of algebra. Comments on these.

11 May 1844 Sender: Augustus de Morgan Reference number: HS/6/205

Autograph letter signed by sender. Hopes the Friendly Society goes on well.

26 June 1844 Sender: Augustus de Morgan Reference number: HS/6/206

Autograph letter signed by sender. Will send the information to Mary Somerville. Death of Francis Baily is most grievous. Hopes John Frederick William Herschel will write an obituary. Society has to elect a new president. Regarding his own algebraic papers.

8 September 1844 Sender: Augustus de Morgan Reference number: HS/6/207

Autograph letter signed by sender. Has been unable to reply to John Frederick William Herschel's note as he was ill. There will be a special General meeting of the society in November to hear the memoir of Francis Baily. Will send all the information as soon as possible. Has invented a new algebraic symbol.

23 September 1844 Sender: Augustus de Morgan Reference number: HS/6/208

Autograph letter signed by sender. Sends rough notes on Francis Baily's interests and works. Has not heard from W. S. Stratford lately.

3 October 1844 Sender: Augustus de Morgan Reference number: HS/6/209

Autograph letter signed by sender. Mr. Malby has obtained copyright of 36' globe and intends to lay down nebulae, also double stars. Is John Frederick William Herschel's work [on double stars] likely to be finished soon? Should wait for this work.

7 October 1844 Sender: Augustus de Morgan Reference number: HS/6/210

Autograph letter signed by sender. Takes great interest in Mr. Malby's globes as he is writing an article on the uses of globes. Comments on the work of Malby.

18 October 1844 Sender: Augustus de Morgan Reference number: HS/6/211

Autograph letter signed by sender. John Frederick William Herschel has forgotten to name the day of his arrival. Can he let Elizabeth Baily know? Thinks he did the right thing in staying at Tavistock Place.

2 November 1844 Sender: Augustus de Morgan Reference number: HS/6/212

Autograph letter signed by sender. Is obliged for his list of James Dunlop. Has been reading John Frederick William Herschel's memoir of Francis Baily. Comments on this.

1 December 1844 Sender: Augustus de Morgan Reference number: HS/6/213

Autograph letter signed by sender. Sending the note for John Frederick William Herschel's son on how to decimalize fractions of a pound. John Frederick William Herschel's memoir has gone to press. Would like details of John Frederick William Herschel's work on the Southern stars for the Annual Report.

24 December 1844 Sender: Augustus de Morgan Reference number: HS/6/214

Copy of a letter. Wants to set up a benefit club; for mutual insurance of artisans, etc., and is asking Augustus De Morgan for actuarial information.

29 January 1844 Sender: John Frederick William Herschel Reference number: HS/22/175

Copy of a letter. Questions about actuarial information in Augustus De Morgan's 1844-1-30.

5 February 1844 Sender: John Frederick William Herschel Reference number: HS/22/176

Copy of a letter. On poor attendance at the Royal Astronomical Society dinner, and on the results of unrestricted population growth.

18 February 1844 Sender: John Frederick William Herschel Reference number: HS/22/177

Copy of a letter. Details of printing the policy for the benefit society.

1844-3 Sender: John Frederick William Herschel Reference number: HS/22/178

Copy of a letter. More details of the benefit society.

1844-3 Sender: John Frederick William Herschel Reference number: HS/22/179

Copy of a letter. More details of the benefit society.

1844-3 Sender: John Frederick William Herschel Reference number: HS/22/180

Copy of a letter. More details of the benefit society.

1844-3 Sender: John Frederick William Herschel Reference number: HS/22/181

Copy of a letter. Discussion of actuarial tables for the benefit society.

7 March 1844 Sender: John Frederick William Herschel Reference number: HS/22/182

Copy of a letter. Under pressure of time, John Frederick William Herschel is anxious to resolve the question of appropriate actuarial tables.

26 March 1844 Sender: John Frederick William Herschel Reference number: HS/22/183

Copy of a letter. Corrections to the actuarial tables.

26 March 1844 Sender: John Frederick William Herschel Reference number: HS/22/184

Copy of a letter. Further emendations regarding printing the policy of the benefit society.

31 March 1844 Sender: John Frederick William Herschel Reference number: HS/22/185

Copy of a letter. Thanks for all the help with the benefit society material.

7 April 1844 Sender: John Frederick William Herschel Reference number: HS/22/188

Copy of a letter. The benefit society is launched and all is well.

29 April 1844 Sender: John Frederick William Herschel Reference number: HS/22/191

Copy of a letter. Forwards a copy of the rules and regulations of the benefit society, with much thanks.

7 May 1844 Sender: John Frederick William Herschel Reference number: HS/22/193

Copy of a letter. Has sent some of Augustus De Morgan's algebra papers to Mary Somerville; comments on death of Francis Baily.

6 September 1844 Sender: John Frederick William Herschel Reference number: HS/22/204

Copy of a letter. Sends a list of James Dunlop's nebulae.

21 November 1844 Sender: John Frederick William Herschel Reference number: HS/22/211

Copy of a letter. Still working on his Cape observations.

28 December 1844 Sender: John Frederick William Herschel Reference number: HS/22/213

Copy of a letter. Government intention to reduce interest in savings banks may well affect John Frederick William Herschel's benefit society.

1844 Sender: John Frederick William Herschel Reference number: HS/22/216

Copy of a letter. John Frederick William Herschel agrees to write a biographical sketch of Francis Baily, and hopes he can count on others for information.

1844-9 or later Sender: John Frederick William Herschel Reference number: HS/22/217

Copy of a letter. Continues to work on biographical sketch of Francis Baily [see John Frederick William Herschel's 1844]; is working through a lot of material to do it.

1844-9 or later Sender: John Frederick William Herschel Reference number: HS/22/218

Copy of letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. Thanks Augustus De Morgan for having pointed out an error in one of John Frederick William Herschel's papers.

1844 or earlier Sender: John Frederick William Herschel Reference number: HS/25/14/3

1845

Sir John Herschel serves as President of the British Association

1845

Autograph letter signed by sender. The memoirs are cut enough already. Hopes his health is better.

7 January 1845 Sender: Augustus de Morgan Reference number: HS/6/215

Autograph letter signed by sender. Elizabeth Baily would like him to write an inscription for her brother's memorial tablet. Francis Baily was buried in the land of his fathers at Thatcham.

4 March 1845 Sender: Augustus de Morgan Reference number: HS/6/216

Autograph letter signed by sender. Suggesting alterations in the wording for the memorial tablet to Francis Baily.

17 March 1845 Sender: Augustus de Morgan Reference number: HS/6/217

Autograph letter signed by sender. Encloses the corrections by his friend T. H. Key to the wording for the memorial to Francis Baily.

18 March 1845 Sender: Augustus de Morgan Reference number: HS/6/218

Autograph letter signed by sender. Further regarding the inscription for the memorial to Francis Baily. Has forwarded it to the executors and translated it for Elizabeth Baily. Wire pens satisfy him.

24 March 1845 Sender: Augustus de Morgan Reference number: HS/6/219

Autograph letter signed by sender. The epitaph has been sent to be drawn onto the stone. Comments on some of the wording. Sends some Alderton's blotting paper and the compliments of the season.

29 March 1845 Sender: Augustus de Morgan Reference number: HS/6/220

Autograph letter signed by sender. Regarding pens and suitable ink for various types. Further comments on the inscription for Francis Baily's memorial tablet.

April 1845 Sender: Augustus de Morgan Reference number: HS/6/221

Autograph letter signed by sender. W. H. Smyth, Thomas Galloway, and Augustus De Morgan went down and visited the library of the Mathematical Society and found it in very good state.

19 May 1845 Sender: Augustus de Morgan Reference number: HS/6/222

Autograph letter signed by sender. Regarding the by-laws of the Society. Does not know anything about the Cambridge Transactions. Recommends various mathematical papers.

28 May 1845 Sender: Augustus de Morgan Reference number: HS/6/223

Autograph letter signed by sender. Hopes he has rested after his Cambridge labors. Comments on Thomas Wright of Durham and his book on the universe, 1750.

21 July 1845 Sender: Augustus de Morgan Reference number: HS/6/224

Autograph letter signed by sender. When John Frederick William Herschel comes to town he will send him the book. Comments on this book [probably one by Wright of Durham] and the works on 'Harmonics' by Robert Smith.

18 August 1845 Sender: Augustus de Morgan Reference number: HS/6/225

Autograph letter signed by sender. Has compared tables A and B and can find no identity between payments. Regarding the moon.

18 November 1845 Sender: Augustus de Morgan Reference number: HS/6/226

Autograph letter signed by sender. Has undertaken the Annual Report again. Has John Frederick William Herschel anything to report? Hopes he is recovering from his cold. Should read Richard Sheepshanks's pamphlet for a good laugh. Further regarding the insurance tables.

29 November 1845 Sender: Augustus de Morgan Reference number: HS/6/227

Copy of a letter. On the subsuming of one scientific society by another; comments favorably on the Memoirs of the Cambridge University Philosophical Society and asks Augustus De Morgan to help fill in John Frederick William Herschel's missing items.

2 May 1845 Sender: John Frederick William Herschel Reference number: HS/22/234

Copy of letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. Thanks for the notice o Thomas Wright's book on the Theory of the Universe. Asks what makes Morgan think 'lightly of Old Harmonic Smith'.

15 August 1845 Sender: John Frederick William Herschel Reference number: HS/22/247

Copy of a letter. On insurance tables for the benefit society; comments on Augustus De Morgan's punning humor; John Frederick William Herschel has a chest cold.

24 November 1845 Sender: John Frederick William Herschel Reference number: HS/22/257

1846

Birth of Francisca Herschel, daughter of John Frederick William Herschel and Margaret Brodie Stewart

1846

Sir John Herschel serves his second term as Foreign Secretary of the Royal Astronomical Society

1846: To 1847

Autograph letter signed by sender. Should have returned the paper before, but has been very busy with the Annual Report and other matters. Paper seems worthy of publication.

5 February 1846 Sender: Augustus de Morgan Reference number: HS/6/228

Autograph letter signed by sender. By which of John Frederick William Herschel's photographic processes can drawings be made permanent? Hopes printing goes on well.

21 July 1846 Sender: Augustus de Morgan Reference number: HS/6/229

Autograph letter signed by sender. Has been planning the new duties for officers of the Royal Astronomical Society now that Francis Baily is dead. Hopes John Frederick William Herschel will consent to become president now, in order to give the prestige of the Society a boost.

29 November 1846 Sender: Augustus de Morgan Reference number: HS/6/230

Draft letter. Would not like to become President and shirk the duties it involves, but if the Royal Astronomical Society cannot find someone else for the President then he will consent to let his name go forward. Has had a letter from W. H. Smyth on the same subject.

4 December 1846 Sender: John Frederick William Herschel Reference number: HS/6/231

Autograph letter signed by sender. Is beginning to work on the Annual Report. Has he any information about F. W. Bessel or J. J. L. Lalande's catalogue?

21 December 1846 Sender: Augustus de Morgan Reference number: HS/6/232

Copy of a letter. Asks Augustus De Morgan for the return of a paper John Frederick William Herschel had sent him.

3 February 1846 Sender: John Frederick William Herschel Reference number: HS/22/267

Copy of a letter. Describes several photographic processes.

23 July 1846 Sender: John Frederick William Herschel Reference number: HS/22/276

Copy of draft letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. Would not like to become President and shirk the duties it involves, but if the Royal Astronomical Society cannot find someone else for the President then he will consent to let his name go forward. Has had a letter from W. H. Smyth on the same subject.

4 December 1846 Sender: John Frederick William Herschel Reference number: HS/22/290

Copy of a letter. Some comments related to several astronomical publication problems; difficulties with naming the planet [Neptune].

24 December 1846 Sender: John Frederick William Herschel Reference number: HS/22/292

1847

Sir John Herschel serves his second term as President of the Royal Astronomical Society

1847: Until 1849

Sir John Herschel receives the Copley Medal

1847: Sir John Herschel receives the Copley Medal of the Royal Society "For his work entitled Results of Astronomical Observations made during the years 1834, 1835, 1836, 1837 and 1838, at the Cape of Good Hope; being a completion of a telescopic survey of the whole surface of the visible heavens, commenced in 1825"

Sir John Herschel publishes a paper

1847: Sir John Herschel publishes Results of astronomical observations made during the years 1834, 5, 6, 7, 8, at the Cape of Good Hope; being a completion of a telescopic survey of the whole surface of the visible heavens, commenced in 1825.

Autograph letter signed by sender. Will do what he can for J. C. Gerhardt. Appears to be unfair regarding Isaac Newton and G. W. Leibniz. Is working on a list of writings in arithmetic.

11 January 1847 Sender: Augustus de Morgan Reference number: HS/6/233

Autograph letter signed by sender. Has seen the papers, which consist of some 30 pages, the longest being in the Commercium Epistolicum. Knows someone who would copy them accurately and at a reasonable price.

17 January 1847 Sender: Augustus de Morgan Reference number: HS/6/234

Autograph letter signed by sender. Giving details of Thatcham Church and of the tablet, which is to be erected in memory of Francis Baily. Sculptor will be sending proof of the inscription.

8 March 1847 Sender: Augustus de Morgan Reference number: HS/6/235

Autograph letter signed by sender. Does he know anything about E. J. Lowe's book [Treatise on Atmospheric Phenomena, 1846] on atmospheric phenomena? Looks good but cannot trust his own judgement. Could not dine with him as he had another appointment.

16 June 1847 Sender: Augustus de Morgan Reference number: HS/6/236

Autograph letter signed by sender. Will send his man to C. R. Weld. F. W. Bessel will be in good time for council. Is glad he is on the last chapter.

29 June 1847 Sender: Augustus de Morgan Reference number: HS/6/237

Copy of a letter. Needs someone to translate German/Latin letters; about James Ross's polar expedition.

8 January 1847 Sender: John Frederick William Herschel Reference number: HS/22/296

Copy of a letter. Thanks for the pains about a translator [see John Frederick William Herschel's 1847-1-8]; preparing biographical information about F. W. Bessel.

28 January 1847 Sender: John Frederick William Herschel Reference number: HS/22/297

Copy of a letter. Sends what John Frederick William Herschel has written on F. W. Bessel.

3 February 1847 Sender: John Frederick William Herschel Reference number: HS/22/300

Copy of a letter. About the dispute in the Royal Astronomical Society over awarding its medal(s) after discovery of Neptune.

8 February 1847 Sender: John Frederick William Herschel Reference number: HS/22/302

Copy of a letter. Thanks for Augustus De Morgan's paper on probability of arguments and on the syllogism.

23 March 1847 Sender: John Frederick William Herschel Reference number: HS/22/312

Copy of letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. Remarks on Mr Lowe's book as an 'unpretending collection of statements' on atmospheric things.

18 June 1847 Sender: John Frederick William Herschel Reference number: HS/22/318

1848

The Pre-Raphaelite Brotherhood is formed, by John Everett Millais, Dante Gabriel Rosetti and others

1848

Napoleon III is elected first President of France

20 December 1848

Autograph letter signed by sender. Enclosing details of the proposed testimonial for meritorious work in astronomy. Would like confirmation of the date of birth of John Frederick William Herschel's aunt.

23 January 1848 Sender: Augustus de Morgan Reference number: HS/6/238

Autograph letter signed by sender. The memoir of John Frederick William Herschel's aunt is forthcoming. Comments on old and new style in calendars.

27 January 1848 Sender: Augustus de Morgan Reference number: HS/6/239

Autograph letter signed by sender. Encloses article for John Frederick William Herschel to work on. Can he inform him of Encke's Christian names?

31 January 1848 Sender: Augustus de Morgan Reference number: HS/6/240

Autograph letter signed by sender. Sending something from Airy relating to the testimonial. Anything he does not use can be returned to Somerset House for Augustus De Morgan.

4 February 1848 Sender: Augustus de Morgan Reference number: HS/6/241

Autograph letter signed by sender. Requesting that John Frederick William Herschel would send notices to all the new honorary members. Eleven testimonials are ready for his signature; would he sign them when next in town. Where shall he send the Cape newspapers?

16 April 1848 Sender: Augustus de Morgan Reference number: HS/6/242

Autograph letter signed by sender. Agrees with his proposals. Will meet him at Barclay the printers or if unable to manage then, will forward the testimonials to Somerset House for his signature.

24 April 1848 Sender: Augustus de Morgan Reference number: HS/6/243

Autograph letter signed by sender. Thinks Herschel is getting on very well with his mathematics. Boys learn mathematics at a much earlier age now. Will have testimonials ready at Barclays if he will name the day. Will bring Cape newspapers to the Society.

28 April 1848 Sender: Augustus de Morgan Reference number: HS/6/244

Autograph letter signed by sender. Returns the papers of John Forbes (on mathematical subject) and comments on them. Suggests what the Royal Society [of London] should do in such cases.

10 May 1848 Sender: Augustus de Morgan Reference number: HS/6/245

Autograph letter signed by sender. The tract John Frederick William Herschel means is by L. A. Sedillot on the history of astronomy of the Arabs. Comments on this. Possesses it but it is bound in with a lot of other papers so is too heavy to send. Would he give John Williams permission to open letters addressed to the President of the Royal Astronomical Society

13 November 1848 Sender: Augustus de Morgan Reference number: HS/6/246

Autograph letter signed by sender. Has been hunting John Frederick William Herschel's proposition through the books and finds that it has dropped out of use, though the older geometrical books include it.

30 November 1848 Sender: Augustus de Morgan Reference number: HS/6/247

Copy of a letter. Some comments about dates related to John Frederick William Herschel's aunt Caroline Herschel.

27 January 1848 Sender: John Frederick William Herschel Reference number: HS/23/9

Copy of a letter. Some additional details about John Frederick William Herschel's aunt Caroline [see John Frederick William Herschel's 1848-1-27].

3 February 1848 Sender: John Frederick William Herschel Reference number: HS/23/10

Copy of a letter. Needs clarification about John Lubbock's planetary theory; thanks for G. B. Airy's lunar reductions.

7 February 1848 Sender: John Frederick William Herschel Reference number: HS/23/11

Copy of a letter. On the origin of the Royal Astronomical Society

1 March 1848 Sender: John Frederick William Herschel Reference number: HS/23/15

Copy of a letter. Organizational matters related to the Royal Astronomical Society; intrigued by Augustus De Morgan's partial differential.

24 April 1848 Sender: John Frederick William Herschel Reference number: HS/23/22

Copy of a letter. About authorship of an encyclopedia article, meeting arrangements, and the mathematical cleverness of his son William.

25 April 1848 Sender: John Frederick William Herschel Reference number: HS/23/23

Sir John Herschel publishes Outlines of Astronomy.

1849

Autograph letter signed by sender. Would he trouble himself about the address only; all the rest will be arranged for him.

2 February 1849 Sender: Augustus de Morgan Reference number: HS/6/248

Draft letter. Returns H. P. Brougham's (Baron Brougham and Vaux) paper. Does not recall any similar theories, but does not think his own theories are shaken by those of Brougham. Finds that Augustus De Morgan has already done extensive work on the calendar.

18 February 1849 Sender: John Frederick William Herschel Reference number: HS/6/249

Autograph letter signed by sender. Finds that some of the pages from the paper John Frederick William Herschel recently sent him are missing. Please send if he still has them. H. P. Brougham (Baron Brougham and Vaux) does not mean to attack the undulating theory. Regarding solar spots and the surface of the moon.

3 March 1849 Sender: Augustus de Morgan Reference number: HS/6/250

Autograph letter signed by sender. Regarding the early history of the calendar. Comments on the various versions.

18 March 1849 Sender: Augustus de Morgan Reference number: HS/6/251

Autograph letter signed by sender. Has received three packets, dated and initialed. Further comments regarding Julius Caesar and the calendar.

27 March 1849 Sender: Augustus de Morgan Reference number: HS/6/252

Autograph letter signed by sender. Many thanks for his astronomy [Outlines Astr.]. Will read it later when he has more time.

5 May 1849 Sender: Augustus de Morgan Reference number: HS/6/253

Autograph letter signed by sender. Sends extracts from book by Mr. Hopkins on the solar system. Has his own theories on the Augustan calendar proved to his own mind. No authority for giving the name Saras to the period of 223 lunations.

22 May 1849 Sender: Augustus de Morgan Reference number: HS/6/254

Autograph letter signed by sender. Regarding their various points of view on a certain question.

2 September 1849 Sender: Augustus de Morgan Reference number: HS/6/255

Copy of a letter. Arrangements about how the Royal Astronomical Society meeting will proceed.

1 February 1849 Sender: John Frederick William Herschel Reference number: HS/23/56

Copy of draft letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. Returns H. P. Brougham's (Baron Brougham and Vaux) paper. Does not recall any similar theories, but does not think his own theories are shaken by those of Brougham. Finds that Augustus De Morgan has already done extensive work on the calendar.

18 February 1849 Sender: John Frederick William Herschel Reference number: HS/23/58

Copy of a letter. On return of a paper, and approval of Augustus De Morgan's method of resolving fractions.

7 March 1849 Sender: John Frederick William Herschel Reference number: HS/23/59

Copy of a letter. Sends Augustus De Morgan part of John Frederick William Herschel's paper on double stars; concerned about Augustus De Morgan's dating it on arrival.

25 March 1849 Sender: John Frederick William Herschel Reference number: HS/23/62

Copy of a letter. Another part of John Frederick William Herschel's double star paper; question of priority between John Frederick William Herschel and Yvon Villarceau.

26 March 1849 Sender: John Frederick William Herschel Reference number: HS/23/63

Copy of a letter. Correction to John Frederick William Herschel's paper on double stars [see John Frederick William Herschel's 1849-3-26 and 1849-3-25].

26 March 1849 Sender: John Frederick William Herschel Reference number: HS/23/64

Copy of a letter. Correction to paper on double stars following up John Frederick William Herschel's 1849-3-26; a terrible pun sent on by John Frederick William Herschel's wife, Margaret.

27 March 1849 Sender: John Frederick William Herschel Reference number: HS/23/65

Copy of a letter. Needs to revise Outlines Astr., and will include Ernesto Capocchi's announcement of the discovery of another planet; some further corrections of John Frederick William Herschel's double star paper.

1849-4 Sender: John Frederick William Herschel Reference number: HS/23/66

Copy of a letter. Seeking a tutor for his young nephews. Yvon Villarceau has sent printed copies of Villarceau's double star papers; John Frederick William Herschel has dealt with them.

26 December 1849 Sender: John Frederick William Herschel Reference number: HS/23/78

1850

Sir John Herschel is appointed Master of the Mint

1850

Autograph letter signed by sender. Regarding the delicate case of priority of investigation. Quotes example of Henry Warburton and John Brinkley.

21 January 1850 Sender: Augustus de Morgan Reference number: HS/6/256

Autograph letter signed by sender. Further regarding the Gregorian calendar and comments on some of the questions involved in its interpretation.

25 January 1850 Sender: Augustus de Morgan Reference number: HS/6/257

Autograph letter signed by sender. Would he drop him a few lines on the orbit of the meteor for the Royal Astronomical Society Robert Potts of Trinity is to publish by subscription a translation of Robert Simson's Porisms.

4 February 1850 Sender: Augustus de Morgan Reference number: HS/6/258

Autograph letter signed by sender. Has never heard the polar axis approximation. John Frederick William Herschel's treatise on perspective must be very complete. John Taylor is his old publisher. Has got 64 more syllogisms symbolized.

26 March 1850 Sender: Augustus de Morgan Reference number: HS/6/259

Autograph letter signed by sender. Guessed the name of his friend. Has not read the article attentively yet. If John Frederick William Herschel is in the south of France he may meet H. P. Brougham (Baron Brougham and Vaux) opticizing. Picked up an old book on the reformation of the calendar owned by C. Clavius 1556. Has sent to Rome for signature.

26 August 1850 Sender: Augustus de Morgan Reference number: HS/6/260

Copy of a letter. Comments on calculation by Frederic Petit of the hyperbolic orbit of the meteor of 19 Aug. 1847.

1850-1 Sender: John Frederick William Herschel Reference number: HS/23/80

Copy of a letter. About Henry Warburton's theorem, and the Gregorian calendar.

24 January 1850 Sender: John Frederick William Herschel Reference number: HS/23/81

Copy of a letter. About John Frederick William Herschel's poor health; some problems in perspective. Having read a book on Egyptology, John Frederick William Herschel wanders off in flights of fanciful numerology.

16 March 1850 Sender: John Frederick William Herschel Reference number: HS/23/85

1851

Sir John Herschel serves as juror of the Great Exhibition

1851

Copy of a letter. About John Frederick William Herschel's poor health; mentions discovery of two asteroids and new rings of Saturn.

7 January 1851 Sender: John Frederick William Herschel Reference number: HS/23/94

1852

Autograph letter signed by sender. Has been examining and sorting all Francis Baily's correspondence with a view to its preservation. Suggests Greenwich as a suitable repository for most of it. Will be returning John Frederick William Herschel's letters for his selection of important letters to be preserved.

25 August 1852 Sender: Augustus de Morgan Reference number: HS/6/261

Autograph letter signed by sender. The job [of sorting Francis Baily's correspondence] may be done at leisure. All his family are at Herne Bay. Regarding chronology. Annibal De Gasparis will be equal with J. R. Hind when he locates another planet. Is astonished how well books last.

29 August 1852 Sender: Augustus de Morgan Reference number: HS/6/262

Copy of a letter. Comments on astronomical discoveries, and depressing life in London.

28 August 1852 Sender: John Frederick William Herschel Reference number: HS/23/124

1853

Autograph letter signed by sender. The book on the coinage of England in the 1670s is by one William Jeake. Comments on the diversity of coins available at that date and how their values changed by proclamation. Should the present coinage be decimalized he hopes the half crown will be withdrawn.

25 March 1853 Sender: Augustus de Morgan Reference number: HS/6/263

Autograph letter signed by sender. Has he heard the names of the coins decided on by the Commons when the Pound is decimalized? W. R. Hamilton has informed him that he has heard from John Frederick William Herschel. Is going to the seaside tomorrow.

3 August 1853 Sender: Augustus de Morgan Reference number: HS/6/264

Autograph letter signed by sender. Intends to send on Francis Baily's letters soon. Would like to see the coinage report.

10 August 1853 Sender: Augustus de Morgan Reference number: HS/6/265

Autograph letter signed by sender. Is sending the packet of Francis Baily's letters today. Sees that Thomas Wright, the Milky Way man, kept a shop in Fleet St. and was a mathematical instrument maker. Warren de La Rue has doubtless sent him his picture of Saturn.

30 August 1853 Sender: Augustus de Morgan Reference number: HS/6/266

Autograph letter signed by sender. Has found a seventeenth-century mathematical manuscript amongst Francis Baily's papers with John Frederick William Herschel's handwriting on it; can he explain the mystery? There is also a letter from P. L. M. Maupertius to James Bradley, which he proposes sending to the Royal Society [of London]

17 October 1853 Sender: Augustus de Morgan Reference number: HS/6/267

Copy of a letter. Asks for the experience of other countries in introducing decimal coinage.

11 April 1853 Sender: John Frederick William Herschel Reference number: HS/23/130

Copy of a letter. John Frederick William Herschel looking for some writings by Isaac Newton while at the Mint, but most of that seems to have vanished.

1853 Sender: John Frederick William Herschel Reference number: HS/23/131

Copy of a letter. Thanks for Augustus De Morgan's report on coinage [see John Frederick William Herschel's 1853-4-11], and for Augustus De Morgan's puns.

9 August 1853 Sender: John Frederick William Herschel Reference number: HS/23/138

1854

Autograph letter signed by sender. Sending an equation for John Frederick William Herschel to solve. Thanks for sending details of the weight of the florin, and the song from Punch. If he wishes John Frederick William Herschel may borrow books from the College library.

1 November 1854 Sender: Augustus de Morgan Reference number: HS/6/268

Autograph letter signed by sender. Sending one of his equations for John Frederick William Herschel's comments.

3 November 1854 Sender: Augustus de Morgan Reference number: HS/6/269

Autographed letter. Sending a comic squib.

29 July 1854 Sender: Augustus de Morgan Reference number: HS/6/433

Copy of a letter. Sends Henry Warburton's equation and integral; thanks Augustus De Morgan for humorous story sent to Collingwood.

2 November 1854 Sender: John Frederick William Herschel Reference number: HS/23/150

Copy of a letter. Accepts Augustus De Morgan's correction regarding Henry Warburton's writings [see John Frederick William Herschel's 1854-11-2].

6 November 1854 Sender: John Frederick William Herschel Reference number: HS/23/151

Copy of a letter. Comments on circulation of new coinage, and on another integral of Henry Warburton's.

1854 Sender: John Frederick William Herschel Reference number: HS/23/152

1855

Birth of Constance Anne Herschel, daughter of John Frederick William Herschel and Margaret Brodie Stewart

1855

Sir John Herschel is elected Foreign Associate of the Institut de France

1855

Sir John Herschel resigns from his position as Master of the Mint

1855

Autograph letter signed by sender. Hopes to hear how he is progressing. Looks as though he wanted rest and air. Sends a theorem for his consideration.

18 March 1855 Sender: Augustus de Morgan Reference number: HS/6/270

Autograph letter signed by sender. Was pleased to see his handwriting again especially as he had heard that John Frederick William Herschel had died. Elizabeth Baily was upset by the death of Richard Sheepshanks. Will be going down for the funeral tomorrow and hopes to meet G. B. Airy and William Simms. Both of John Frederick William Herschel's daughters have corresponded with him over his health.

9 August 1855 Sender: Augustus de Morgan Reference number: HS/6/272

Autograph letter signed by sender. Is glad to hear that his health is improving. Has been preparing the wording of a tablet to be erected in memory of Richard Sheepshanks. Sends a proof of one of his theorems.

23 September 1855 Sender: Augustus de Morgan Reference number: HS/6/273

Autograph letter signed by sender. Was pleased to hear from Elizabeth Baily that John Frederick William Herschel is improving in health. Knows a doctor who can produce jaundice. Plan is on foot to publish Francis Baily's travels in America. Hopes John Frederick William Herschel will allow his life of Baily to be included. Monument to Richard Sheepshanks is under consideration.

20 October 1855 Sender: Augustus de Morgan Reference number: HS/6/274

Autograph letter signed by sender. Was pleased to see his signature again and to hear that he is in good spirits. He will turn into a chemist. Will send him a proof of his article and appendices upon Francis Baily.

10 November 1855 Sender: Augustus de Morgan Reference number: HS/6/275

Autograph letter signed by sender. Thinks of putting John Frederick William Herschel's notes at the end of the life [of Francis Baily].

21 November 1855 Sender: Augustus de Morgan Reference number: HS/6/276

Autograph letter signed by sender. John Frederick William Herschel's handwriting is improving, which shows he is on the mend. Does not propose to show the failure of the scale. Quotes an error in his Latin.

6 December 1855 Sender: Augustus de Morgan Reference number: HS/6/277

Autograph letter signed by sender. Submitting a vote for John Frederick William Herschel's comment. Quotes various points of Latin grammar.

7 December 1855 Sender: Augustus de Morgan Reference number: HS/6/278

Autograph letter signed by sender. Is glad to hear his health is improving. Has heard that John Frederick William Herschel is holding a large reception for all his descendents. Is progressing well with the book [on Francis Baily]. Sends a puzzle in spherical trigonometry.

25 December 1855 Sender: Augustus de Morgan Reference number: HS/6/279

Copy of a letter. Expresses great sorrow at the death of Richard Sheepshanks; John Frederick William Herschel has been ill for many months.

6 August 1855 Sender: John Frederick William Herschel Reference number: HS/23/157

Autograph letter signed by sender. Wishing him well for the new year. Hears John Frederick William Herschel has visited the East India College. Sends a theorem. H. P. Brougham (Baron Brougham and Vaux) amuses himself by finding the laws of central force for curves. Has been finding information on a nephew of Isaac Newton. George Stanhope (6th Earl of Chesterfield) and T. A. W. Parker (9th Earl of Macclesfield) were pupils of Abraham De Moivre.

7 January 1856 Sender: Augustus de Morgan Reference number: HS/6/280

Autograph letter signed by sender. Has not heard from him for a long time. Thought that the Government was going to turn the Royal Astronomical Society out of Somerset House. There is someone to come to the rescue of Richard Sheepshanks. Has not seen Charles Babbage for many years. Their views are incompatible. C. P. Smyth is off to Teneriffe so now is the time for John Frederick William Herschel to make suggestions. Has set up a committee to make by-laws.

11 May 1856 Sender: Augustus de Morgan Reference number: HS/6/281

Autograph letter signed by sender. Is glad to hear his account of facts. Always thought he would recover his health. Gives one of his own mathematical formulae. Has no idea how the Decimal Coinage Commission is progressing.

20 May 1856 Sender: Augustus de Morgan Reference number: HS/6/282

Autograph letter signed by sender. Would he answer some of his queries when he has leisure? Queries on the law of beats for unison sounds. Met John Frederick William Herschel's daughter on Monday, who gave a fair account of John Frederick William Herschel and his recent work.

4 June 1856 Sender: Augustus de Morgan Reference number: HS/6/283

Autograph letter signed by sender. Has long held the view that a pipe underneath the strings of a piano would increase the resonance. Had not conceived such an instrument as John Frederick William Herschel suggested. Why are 3rds and 6ths more agreeable to the ear than 4ths and 5ths?

8 June 1856 Sender: Augustus de Morgan Reference number: HS/6/284

Autograph letter signed by sender. Sending a pamphlet, which may give John Frederick William Herschel some amusement.

19 July 1856 Sender: Augustus de Morgan Reference number: HS/6/285

Autograph letter signed by sender. John Frederick William Herschel's last letter was written in a good strong hand. Recommends suitable drink for hot weather. Gives his views about the possible marriage of Isaac Newton's niece. Has had a letter from a Mr. Wither on mathematical books.

15 August 1856 Sender: Augustus de Morgan Reference number: HS/6/286

Autograph letter signed by sender. Many thanks for his invitation, but he does not intend going to Eastbourne. Further remarks on his own theory regarding the marriage of Isaac Newton's niece.

25 August 1856 Sender: Augustus de Morgan Reference number: HS/6/287

Autograph letter signed by sender. Has fallen from a ladder in his library and dislocated his shoulder, which accounts for the form of his letter. Has he any recollections of Humphry Davy rubbing his hands together?

10 September 1856 Sender: Augustus de Morgan Reference number: HS/6/288

Draft letter. Thought that Augustus De Morgan's last letter was supposed to be written in verse. Hopes his injury will soon improve. Does not recollect any habit of Humphry Davy rubbing his hands together. A professor, [G. J.?] Stoney, has re-invented John Frederick William Herschel's collimating telescope and not improved it.

12 September 1856 Sender: John Frederick William Herschel Reference number: HS/6/289

Autograph letter signed by sender. Quotes a rhyme. May have been injured even if he had been at Collingwood. Possibly [G. J.?] Stoney has not read John Frederick William Herschel on the telescope. Is thriving in health but sleeping very well.

13 September 1856 Sender: Augustus de Morgan Reference number: HS/6/290

Autograph letter signed by sender. Hopes his health is improving as his own is. Saw Henry Warburton last week. Gives one of his own theorems. Sends a lecture on the decimal coinage.

8 November 1856 Sender: Augustus de Morgan Reference number: HS/6/291

Copy of a letter. Comments on the state of John Frederick William Herschel's health, and on things astronomical and mathematical.

19 May 1856 Sender: John Frederick William Herschel Reference number: HS/23/172

Copy of draft letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. Thought that Augustus De Morgan's last letter was supposed to be written in verse. Hopes his injury will soon improve. Does not recollect any habit of Humphry Davy rubbing his hands together. A professor, [G. J.?] Stoney, has re-invented John Frederick William Herschel's collimating telescope and not improved it.

12 September 1856 Sender: John Frederick William Herschel Reference number: HS/23/181

Copy of a letter. Comments on the state of John Frederick William Herschel's health, color blindness, missing the Royal Astronomical Society Notices, and decimal coinage.

11 November 1856 Sender: John Frederick William Herschel Reference number: HS/23/183

Copy of letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. Wants to make a new musical instrument on the principle of resonance; John Frederick William Herschel also suggests some improvements in the construction of the organ.

1856-6-7 or earlier Sender: John Frederick William Herschel Reference number: HS/25/14/7

1857

Autograph letter signed by sender. Thanks for the magic square, which he is now returning. Seems no end to the possibilities of such squares.

16 January 1857 Sender: Augustus de Morgan Reference number: HS/6/293

Autograph letter signed by sender. John Frederick William Herschel has got hold of the explanation about central forces. Need not worry about Elizabeth Baily; he will see to that. Do not reject any letters; they may be important in the future. Gives one of his own theorems.

8 February 1857 Sender: Augustus de Morgan Reference number: HS/6/294

Autograph letter signed by sender. Sees by the announcement that he is to be out in April. Is there anything he can do in the way of proof reading? Is preparing answers to 65 queries of S. J. Loyd (1st Baron Overstone) on the decimal coinage.

29 March 1857 Sender: Augustus de Morgan Reference number: HS/6/295

Autograph letter signed by sender. Sending a little joke on a political theme. Further regarding a query of John Frederick William Herschel's on a rabbit. Gives a problem on a polygon. Meteorology is peculiar as weather does not appear to be governed by any laws.

2 April 1857 Sender: Augustus de Morgan Reference number: HS/6/296

Autograph letter signed by sender. Returns his cancel, which he found very amusing. Mrs. De Morgan is now at Hampstead suffering from an incurable complaint. Further comments on the beats of musical consonances and Robert Smith's theories.

20 May 1857 Sender: Augustus de Morgan Reference number: HS/6/297

Autograph letter signed by sender. Hopes his health is improving. Where can he find the article expressing adjectives in algebraic symbols? Went to the Royal Astronomical Society in July and found much as usual. Mrs. De M. now at Hythe with the children. Elizabeth Baily appears to be in excellent health.

7 August 1857 Sender: Augustus de Morgan Reference number: HS/6/298

Draft letter. Regarding the possibility of decimal coinage. Washes his hands of adjectives expressed in algebraic form. Has received good news from India.

8 October 1857 Sender: John Frederick William Herschel Reference number: HS/6/299

Autograph letter signed by sender. S. J. Loyd's (1st Baron Overstone) queries and the work of the Commission on the Decimal Coinage. Is sure he read the algebraic adjectives in the Memoirs of the Analytical Society. May be related in some way. His wife is slowly recovering. Has John Frederick William Herschel read about the Devil's Elixir?

9 October 1857 Sender: Augustus de Morgan Reference number: HS/6/300

Autograph letter signed by sender. Has received a list of witnesses whose answers have been printed for Thomas Spring-Rice (1st Baron Monteagle).

11 October 1857 Sender: Augustus de Morgan Reference number: HS/6/301

Autograph letter signed by sender. Hopes the Indian mail has taken a weight off John Frederick William Herschel's mind. George Peacock is anxious that John Frederick William Herschel should be in their plot regarding the introduction of the decimal coinage.

14 October 1857 Sender: Augustus de Morgan Reference number: HS/6/302

Autograph letter signed by sender. Will send the proofs. Has heard all about John Frederick William Herschel's ancestor [Hercules]. Miss Louisa has committed manslaughter.

23 October 1857 Sender: Augustus de Morgan Reference number: HS/6/303

Autograph letter signed by sender. Has the proofs. Gives some queries concerning them.

11 November 1857 Sender: Augustus de Morgan Reference number: HS/6/304

Autograph letter signed by sender. S. J. Loyd (1st Baron Overstone) has agreed that the papers be presented to the Crown. Pray let him have his proof as soon as possible.

13 November 1857 Sender: Augustus de Morgan Reference number: HS/6/305

Autograph letter signed by sender. Write to Mr. Richerly for as many as he wants. Has sent proof to George Peacock; might send one to the Dean of Salisbury. County persons are capital people for their purposes.

27 November 1857 Sender: Augustus de Morgan Reference number: HS/6/306

Copy of a letter. Offers Augustus De Morgan a puzzle and John Frederick William Herschel's solution to Augustus De Morgan's problem about a body revolving in the evolute of an ellipse. On sending Francis Baily's correspondence to Greenwich.

1857-2 Sender: John Frederick William Herschel Reference number: HS/23/190

Copy of a letter. Reading proofs of John Frederick William Herschel's Essays Q. E. R.; working on an article on meteorology.

1 April 1857 Sender: John Frederick William Herschel Reference number: HS/23/192

Copy of a letter. On some odd results John Frederick William Herschel has arrived at about P. S. Laplace's barometric formula.

16 May 1857 Sender: John Frederick William Herschel Reference number: HS/23/200

Copy of a letter. On magic squares.

10 June 1857 Sender: John Frederick William Herschel Reference number: HS/23/204

Copy of draft letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. Regarding the possibility of decimal coinage. Washes his hands of adjectives expressed in algebraic form. Has received good news from India.

8 October 1857 Sender: John Frederick William Herschel Reference number: HS/23/207

Copy of a letter. Comments about John Frederick William Herschel's ancestor, Hercules, and replies to S. J. Loyd's (1st Baron Overstone) queries [see Augustus De Morgan's 1857-10-9].

21 October 1857 Sender: John Frederick William Herschel Reference number: HS/23/210

Copy of a letter. A proposition in perspective, and some nonsense.

26 November 1857 Sender: John Frederick William Herschel Reference number: HS/23/215

1858

Autograph letter signed by sender. Too busy to answer his last letter until now. His theorem on perspective is pretty and easy. Quotes one he uses. Has been busy finding the proof that every algebraic equation has a root. Has been organ tuning. Comments on the method of tuning using beats.

1 January 1858 Sender: Augustus de Morgan Reference number: HS/6/307

Autograph letter signed by sender. Congratulations and best wishes for John Frederick William Herschel's daughter recently married. If he has any material for the annual report, please send it.

1 February 1858 Sender: Augustus de Morgan Reference number: HS/6/308

Autograph letter signed by sender. Queries on what meridian the year began. Returned a book to the Royal Society [of London], which had been away for many years. Believes the Royal Society [of London] Library was expurgated between 1734 and 1740.

7 February 1858 Sender: Augustus de Morgan Reference number: HS/6/309

Autograph letter signed by sender. Further regarding the meridian on which the year began and various times throughout the world.

11 February 1858 Sender: Augustus de Morgan Reference number: HS/6/310

Autograph letter signed by sender. Regarding the recent eclipse of the sun. Has not been able to guess all his riddles.

20 March 1858 Sender: Augustus de Morgan Reference number: HS/6/311

Autograph letter signed by sender. Has examined the animalcules John Frederick William Herschel sent. Sends some of his own obtained from ink! Regarding the variations of spelling his own name.

25 May 1858 Sender: Augustus de Morgan Reference number: HS/6/312

Autograph letter signed by sender. Has not heard from him for a long time. Hopes all is well. Elizabeth Baily has had a stroke but is slowly mending. Arthur Baily has committed suicide. His own wife and children are at the seaside. Hopes John Frederick William Herschel or one of his daughters will write soon.

7 August 1858 Sender: Augustus de Morgan Reference number: HS/6/313

Autograph letter signed by sender. Sees that John Frederick William Herschel was the author of the article on mathematics in Brewster's Encyclopaedia. Comments on this and Isaac Newton's authorship of the notes and review of the Commercium Epistolicum.

26 August 1858 Sender: Augustus de Morgan Reference number: HS/6/314

Autograph letter signed by sender. John Frederick William Herschel keeps his astronomy right up to date. Regarding the significance of the word 'month' in legal phraseology. Gives two riddles.

1 September 1858 Sender: Augustus de Morgan Reference number: HS/6/315

Autograph letter signed by sender. Does not intend writing a life of Isaac Newton or G. W. Leibniz. Comments on the apparent delusions of Newton regarding other men's inventions.

15 September 1858 Sender: Augustus de Morgan Reference number: HS/6/316

Autograph letter signed by sender. Sending a query regarding John Frederick William Herschel's philosophy.

15 October 1858 Sender: Augustus de Morgan Reference number: HS/6/317

Autograph letter signed by sender. John Frederick William Herschel has turned round his question. Samuel Earnshaw has professed to have integrated the pipe equation. Gives an equation of his own.

18 October 1858 Sender: Augustus de Morgan Reference number: HS/6/318

Autograph letter signed by sender. Does not intend trying for the Lowndean Professorship. Hopes that John Frederick William Herschel has been asked to do a memoir of George Peacock. Hears he has been traveling about the country. Sends a riddle.

15 November 1858 Sender: Augustus de Morgan Reference number: HS/6/319

Autograph letter signed by sender. Regarding George Peacock and his mathematical work. Gives some of his own theories, which he intends publishing. Includes a riddle.

18 December 1858 Sender: Augustus de Morgan Reference number: HS/6/320

Autograph letter signed by sender. Would John Frederick William Herschel extract the dates from his memoir of George Peacock as Augustus De Morgan must write something for the Royal Astronomical Society Encloses some meteorological queries.

28 December 1858 Sender: Augustus de Morgan Reference number: HS/6/321

Copy of a letter. About insects John Frederick William Herschel's children caught and photographed; on a book on harmonics.

22 May 1858 Sender: John Frederick William Herschel Reference number: HS/23/231

Copy of a letter. Errors to be corrected in a new edition of one of John Frederick William Herschel's writings, including spelling Augustus De Morgan's name in the French way.

12 September 1858 Sender: John Frederick William Herschel Reference number: HS/23/236

Autograph letter signed by sender. Many thanks for the dates for the memoir of George Peacock. Queries the name of his father. Comments on various church matters.

1 January 1859 Sender: Augustus de Morgan Reference number: HS/6/322

Autographed letter . Many thanks for the information. Finds that George Peacock wrote a book entitled the Measurer. Someone has sent him a geometrical question with abominable diagrams.

6 January 1859 Sender: Augustus de Morgan Reference number: HS/6/323

Autograph letter signed by sender. Sends a riddle. Has added a stanza. Does not credit the story of [T. C.?] Jansen's children. Comments on Roger Bacon's telescope.

11 February 1859 Sender: Augustus de Morgan Reference number: HS/6/324

Autograph letter signed by sender. Hopes he is well as he has not heard from him for a long time. Sends his own theories regarding the composition of force.

24 February 1859 Sender: Augustus de Morgan Reference number: HS/6/325

Autograph letter signed by sender. Did his work on the Southern Constellations bring him into contact with a Frederic Houtmann? Regarding a manuscript stated to be by Galileo.

2 May 1859 Sender: Augustus de Morgan Reference number: HS/6/326

Autograph letter signed by sender. Regarding one of John Frederick William Herschel's riddles. Sees he must write an article on Frederic Houtmann. Will be glad of the information on Galileo.

6 May 1859 Sender: Augustus de Morgan Reference number: HS/6/327

Autograph letter signed by sender. What does he make of the accompanying quotation from Amerigo Vespucci?

8 May 1859 Sender: Augustus de Morgan Reference number: HS/6/328

Autograph letter signed by sender. Thanks for his pamphlet; will comment on it later when he has properly read it. Regarding Maine de Biran and his philosophy. Gives some of his own theories.

18 May 1859 Sender: Augustus de Morgan Reference number: HS/6/329

Autograph letter signed by sender. Is suffering from the heat. Was grateful for his information on Galileo's handwriting. Outlines the facts of the recent controversy on a reputed manuscript of Galileo. Will be moving house shortly.

12 July 1859 Sender: Augustus de Morgan Reference number: HS/6/330

Autograph letter signed by sender. Elizabeth Baily died this morning, quietly and painlessly. Her last few weeks had been saddened by delusions.

6 September 1859 Sender: Augustus de Morgan Reference number: HS/6/331

Autograph letter signed by sender. All arrangements have been made for the burial of Elizabeth Baily. When did John Frederick William Herschel first become acquainted with Francis Baily? Gives his own earliest recollections. Has now placed all his books on their shelves.

9 September 1859 Sender: Augustus de Morgan Reference number: HS/6/332

Autograph letter signed by sender. Hears that John Frederick William Herschel is to inherit Baily's house. Recalls how he first met W. H. Wollaston and Francis Baily.

18 September 1859 Sender: Augustus de Morgan Reference number: HS/6/333

Autograph letter signed by sender. Someone has experimented with sound and finds that the pitch of a note is altered when transmitted through solids; is this true in John Frederick William Herschel's experience? Supposes that Lady Herschel has now returned.

4 November 1859 Sender: Augustus de Morgan Reference number: HS/6/334

Copy of a letter. Responds to Augustus De Morgan's 1859-2-24 on forces, which degenerates into nonsense; comments on James Kemplay's writing on comets.

7 March 1859 Sender: John Frederick William Herschel Reference number: HS/23/257

Sir John Herschel publishes in the Proceedings of the Royal Society

1860: Sir John Herschel publishes some “Remarks on colour-blindness" extracted from a referee report on Pole’s paper on the same subject.

Autograph letter signed by sender. Has a copy of J. R. Young's investigation. Gives one of his own theorems.

17 April 1860 Sender: Augustus de Morgan Reference number: HS/6/335

Autograph letter signed by sender. His strength is improving. The Airys are off to Bilboa.

6 July 1860 Sender: Augustus de Morgan Reference number: HS/6/336

Autograph letter signed by sender. Is he thinking of letting Francis Baily's house at Tavistock Place as he knows someone who is desirous of renting it. Was able to walk two miles at a quick pace yesterday. Rest of his family are at the seaside.

2 September 1860 Sender: Augustus de Morgan Reference number: HS/6/337

Autograph letter signed by sender. Knew he would get a speedy answer. Quick, the Bristol bookseller, has sent him an edition of Francis Walkingame's Arithmetic. Thinks John Frederick William Herschel is right to sell Francis Baily's house. G. B. Libri may wish to buy. His puns are unavoidable. Hopes John Frederick William Herschel will have his house valued.

5 September 1860 Sender: Augustus de Morgan Reference number: HS/6/338

Autograph letter signed by sender. Thanks for the newspaper cutting repudiating his wisdom on weather matters. Has had erroneous charges laid at his own door. What arms has he taken?

12 September 1860 Sender: Augustus de Morgan Reference number: HS/6/339

Autograph letter signed by sender. Sending a moral song. Sent one to W. H. Smyth.

22 September 1860 Sender: Augustus de Morgan Reference number: HS/6/340

Autograph letter signed by sender. Can John Frederick William Herschel come in on Sunday evening? Where do the authors of drinking songs get their facts?

28 September 1860 Sender: Augustus de Morgan Reference number: HS/6/341

Autograph letter signed by sender. Thanks for his article on the telescope. Comments on this. Sends another extract from a drinking song. Hopes that G. B. Airy will be the next president of the Royal Astronomical Society

29 November 1860 Sender: Augustus de Morgan Reference number: HS/6/342

Copy of a letter. A story about Voltaire; arrangements to visit Augustus De Morgan.

1860 Sender: John Frederick William Herschel Reference number: HS/23/292

Copy of a letter. Selling house [in London]; comments on H. S. Boase's writing on annuities.

4 September 1860 Sender: John Frederick William Herschel Reference number: HS/23/307

1861

Death of Margaret Louisa Marshall, née Herschel, daughter of John Frederick William Herschel and Margaret Brodie Stewart

1861

William Morris established the decorative design firm of Morris, Marshall, Faulkner & Company (later Morris & Company)

1861

Charles Dickens publishes Great Expectations as a three-volume book

1861

Sir John Herschel publishes Physical Geography as part of the Encyclopaedia Britannica.

1861

Abraham Lincoln begins his term as President of the United States

4 March 1861

Autograph letter signed by sender. Is pleased John Frederick William Herschel can look his trial in the face. Regarding logic. Has seen a neat construction by John Frederick William Herschel's son.

1861 Sender: Augustus de Morgan Reference number: HS/6/343

Autograph letter signed by sender. Has heard of the heavy blow that has fallen on the Herschels [death of John Frederick William Herschel's daughter Margaret Louisa]. Hopes they are all bearing up.

19 January 1861 Sender: Augustus de Morgan Reference number: HS/6/344

Autograph letter signed by sender. Many thanks for his new projection of the sphere. J. L. Lagrange has two papers of 1779 on the subject. John Lee elected president at the Royal Astronomical Society He himself has resigned from the council.

17 March 1861 Sender: Augustus de Morgan Reference number: HS/6/345

Autograph letter signed by sender. Has not heard from him for a long time. Did he receive his red and black logarithms? John Frederick William Herschel's son Alexander has sent him a mathematical problem. George Bishop has died and the observatory and instruments are to be sold. Sends two riddles. Sees that John Frederick William Herschel has proved that the sun is liquid fire.

1 July 1861 Sender: Augustus de Morgan Reference number: HS/6/346

Autograph letter signed by sender. Sends a sonnet on the comet. Regarding works on spheroidal triangles. Supposes he may use the Feldhausen anecdote. Regarding the law of facility.

15 July 1861 Sender: Augustus de Morgan Reference number: HS/6/347

Autograph letter signed by sender. Has sent the packet of letters written to Francis Baily to Greenwich, but kept back one or two including the one on the Royal Society [of London] Secretaryship. Is told that James South is now suffering from deafness. Has sent a paper on errors of observation to Cambridge. Comments on this.

6 October 1861 Sender: Augustus de Morgan Reference number: HS/6/348

Autographed letter . Regarding the unsuitableness of the weather for astronomers. Sends an answer to one of John Frederick William Herschel's equations. Regarding the quarrels of Sir James South. Sends some nursery rhymes that seem appropriate.

14 October 1861 Sender: Augustus de Morgan Reference number: HS/6/349

Copy of a letter. Raised from his lethargy by the appearance of the comet; comments on the nature of the sun; can Augustus De Morgan recommend a book on surveying for John Frederick William Herschel's son John.

14 July 1861 Sender: John Frederick William Herschel Reference number: HS/23/334

1862

Autograph letter signed by sender. Sent his paper on probabilities a few days ago. Shows how his own method is different from that of L. A. J. Quetelet. Sends a poem.

19 April 1862 Sender: Augustus de Morgan Reference number: HS/6/350

Autograph letter signed by sender. Many thanks for the hexameters. Comments on these and the meter of English poetry.

29 April 1862 Sender: Augustus de Morgan Reference number: HS/6/351

Autograph letter signed by sender. Many years ago John Frederick William Herschel had said his time was nearly up; now he is doing it again. Hopes it is a good omen. Regarding Greek hexameters and English translations of heroic poetry.

3 May 1862 Sender: Augustus de Morgan Reference number: HS/6/352

Autograph letter signed by sender. Is meditating on a paper on the infinity of magnitude. Does he recollect a paper by J. J. Sylvester on the passage of a bullet in a gun barrel?

26 May 1862 Sender: Augustus de Morgan Reference number: HS/6/353

Draft letter. Hopes Augustus De Morgan will be successful in his projected paper on the infinity of magnitude. Does not recollect the paper by J. J. Sylvester. Has had a letter from Manchester on his own theory of eternal existence.

29 May 1862 Sender: John Frederick William Herschel Reference number: HS/6/354

Autograph letter signed by sender. Suspects that J. J. Sylvester and John Frederick William Herschel agree in their theories. Is inclined to agree with them as his third paper on logic shows. Has read John Frederick William Herschel's book and will return it soon. Has 30,000 life policies to calculate.

30 May 1862 Sender: Augustus de Morgan Reference number: HS/6/355

Autograph letter signed by sender. Should not imagine that he is declining when a hot day comes along. Regarding Thomas Harriot and his theological views.

25 July 1862 Sender: Augustus de Morgan Reference number: HS/6/356

Autograph letter signed by sender. His family are now by the sea in Wales. Comments on translations.

3 August 1862 Sender: Augustus de Morgan Reference number: HS/6/357

Autograph letter signed by sender. Returns John Frederick William Herschel's manuscript on algebra. Wishes parts of it had been published. Wrote a treatise on mechanics, which he submitted to the University when applying for his present position. Regarding J. L. F. Bertrand and their papers on series.

9 August 1862 Sender: Augustus de Morgan Reference number: HS/6/358

Autograph letter signed by sender. Does not use tables for rough and ready work, but backs his tables against the slide rule. Thanks for the dialogue ['On Atoms']. Regarding blind atoms.

15 August 1862 Sender: Augustus de Morgan Reference number: HS/6/359

Copy of a letter. John Frederick William Herschel's inability to concentrate; comments in reply to Augustus De Morgan's 1862-4-19 and 1862-4-29.

2 May 1862 Sender: John Frederick William Herschel Reference number: HS/23/372

Copy of draft letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. Hopes Augustus De Morgan will be successful in his projected paper on the infinity of magnitude. Does not recollect the paper by J. J. Sylvester. Has had a letter from Manchester on his own theory of eternal existence.

29 May 1862 Sender: John Frederick William Herschel Reference number: HS/23/376

Copy of a letter. On preparing convenient small tables to be carried with one; comments on concept formation.

14 August 1862 Sender: John Frederick William Herschel Reference number: HS/23/383

1863

Autograph letter signed by sender. Is sorry to hear that the John Frederick William Herschels have fever in the house. Hopes it will soon move away. Fever has been prevalent in Kent this year. Believes London is more healthy. Sends a problem.

5 March 1863 Sender: Augustus de Morgan Reference number: HS/6/360

Autograph letter signed by sender. Hopes all is well. Has not seen the point about James Challis to which John Frederick William Herschel refers, but Challis has produced strange theorems.

7 March 1863 Sender: Augustus de Morgan Reference number: HS/6/361

Autograph letter signed by sender. Sends an extract from J. J. Lalande's article on planets from the Encyclopedie methodique. Sends two of his own theorems.

20 March 1863 Sender: Augustus de Morgan Reference number: HS/6/362

Autograph letter signed by sender. Like Professor Olearius Schneiderhausen, Augustus De Morgan has had only one coat in two years. John Frederick William Herschel will go on for many more years. Sends one of his theorems.

10 May 1863 Sender: Augustus de Morgan Reference number: HS/6/363

Autograph letter signed by sender. Regarding translations of Walter Mapes regarding the origin of the word theodolite.

15 July 1863 Sender: Augustus de Morgan Reference number: HS/6/364

Draft letter. Agrees that the weather is hot. The word theodolite. Where did he obtain his verses by Walter Mapes? Why not come and visit them?

17 July 1863 Sender: John Frederick William Herschel Reference number: HS/6/365

Autograph letter signed by sender. Wife and family are on holiday at Portmadoc. Obtains his rhymes from Thomas Wright's Political Songs of England. Relates a tale of how a priest tricked a farmer in medieval times.

8 August 1863 Sender: Augustus de Morgan Reference number: HS/6/366

Autograph letter signed by sender. Regarding a suitable length for the proposed metric system. Hopes the metrical people will continue to agitate.

19 November 1863 Sender: Augustus de Morgan Reference number: HS/6/367

Copy of a letter. Comments on family health; asks Augustus De Morgan if he has read James Challis on the topics of the ether and of zodiacal light.

26 February 1863 Sender: John Frederick William Herschel Reference number: HS/23/363

Copy of draft letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. Agrees that the weather is hot. The word theodolite. Where did he obtain his verses by Walter Mapes? Why not come and visit them?

17 July 1863 Sender: John Frederick William Herschel Reference number: HS/24/18

Copy of a letter. Comments on Greek fire lead John Frederick William Herschel into a variety of recollections.

27 October 1863 Sender: John Frederick William Herschel Reference number: HS/24/22

1864

Autograph letter signed by sender. Hopes all are well. Comments on Charles Babbage's latest book. Intends telling the truth about James Ivory's delusions. Sends proof that ten is an even number.

12 February 1864 Sender: Augustus de Morgan Reference number: HS/6/368

Autograph letter signed by sender. Returns a book of poetry. His family is at Hastings. Sends a theorem.

2 May 1864 Sender: Augustus de Morgan Reference number: HS/6/369

Autograph letter signed by sender. Does not like the sound of the bronchitis. Gives a remedy that he found effective. Gives one of his own ciphers.

15 July 1864 Sender: Augustus de Morgan Reference number: HS/6/370

Autograph letter signed by sender. Has been in a state of collapse all day, but a dose of '02H' has worked wonders. Gives anecdotes of Diogenes and Plato.

24 July 1864 Sender: Augustus de Morgan Reference number: HS/6/371

Autograph letter signed by sender. Did John Frederick William Herschel know when he was Master of the Mint that Isaac Newton had introduced a golden quarter-guinea? Most of his family are at Aldeburgh. Does he know Tristram Shandy's sense of proportion? Charles Babbage has become a public benefactor by the passing of the act against barrel organs.

18 August 1864 Sender: Augustus de Morgan Reference number: HS/6/372

Autograph letter signed by sender. Has a quarter sovereign given him by Thomas Graham. Will mention the coin in Notes and Queries. Gives a pun on his own name. Anecdote of rain in India when his father and mother were travelling.

21 August 1864 Sender: Augustus de Morgan Reference number: HS/6/373

Autograph letter signed by sender. Regarding the antiquity of the + and - signs. Origin of quid vides.

13 September 1864 Sender: Augustus de Morgan Reference number: HS/6/374

Autograph letter signed by sender. Hears that John Frederick William Herschel sits in his study with a stove. This is unhealthy for anyone with bronchial tendencies.

16 September 1864 Sender: Augustus de Morgan Reference number: HS/6/375

Autograph letter signed by sender. John Frederick William Herschel expressed himself with great precision in the old Discourses. Concerning one of the publications of the B.A.A.S.

20 September 1864 Sender: Augustus de Morgan Reference number: HS/6/376

Autograph letter signed by sender. Has long advocated the right to contract. Has no fear that the metrical system will become compulsory. American named J. W. Nystrom wishes to introduce a unit of 16. Comments on the Bible being 'every word of it is God's word.'

2 October 1864 Sender: Augustus de Morgan Reference number: HS/6/377

Copy of a letter. Comments on metrification.

21 April 1864 Sender: John Frederick William Herschel Reference number: HS/24/40

Copy of a letter. Comments on some mathematical problems; asks if Augustus De Morgan knows about a German geometer by the name of [Bernhard] Riemann; suggests some new names for trigonometry.

3 May 1864 Sender: John Frederick William Herschel Reference number: HS/24/43

Copy of a letter. Comments on health of family, and on parliament considering a bill to change weights and measures.

4 May 1864 Sender: John Frederick William Herschel Reference number: HS/24/44

Copy of a letter. Comments on the state of John Frederick William Herschel's health; about ciphers and about decimalization.

14 July 1864 Sender: John Frederick William Herschel Reference number: HS/24/52

Copy of a letter. Comments on remedies suggested by Augustus De Morgan [see Augustus De Morgan's 1864-7-15]; on ciphers.

18 July 1864 Sender: John Frederick William Herschel Reference number: HS/24/53

Copy of a letter. Comments on minting of coins [see Augustus De Morgan's 1864-8-18], the state of John Frederick William Herschel's health, and the need for an elocution teacher for one of John Frederick William Herschel's sons.

19 August 1864 Sender: John Frederick William Herschel Reference number: HS/24/57

Copy of a letter. On algebraic signs, riddles, and the state of John Frederick William Herschel's health.

15 September 1864 Sender: John Frederick William Herschel Reference number: HS/24/60

1865

Autograph letter signed by sender. The winter has not killed them, though his wife is a convalescent. Knows Mr. Peters as he is a member of the Athenaeum. Airy has fun in him and a love of Greek Drama. Charles Babbage and James South are at war again. Sends jokes.

6 April 1865 Sender: Augustus de Morgan Reference number: HS/6/378

Autograph letter signed by sender. W. R. Hamilton and W. H. Smyth are dead. Corresponded with Hamilton for 30 years though only met him once. Has before him the proofs of his own paper on the origin of the + and - signs.

13 September 1865 Sender: Augustus de Morgan Reference number: HS/6/379

Autograph letter signed by sender. Has no information about H. T. Colebrooke. Has been corresponding with T. B. [?] Macaulay (1st Baron Macaulay) regarding the marriage of Isaac Newton's niece. Has John Frederick William Herschel heard the story of George III and his madness.

21 September 1865 Sender: Augustus de Morgan Reference number: HS/6/380

Autograph letter signed by sender. Regarding the story of George III and his reason for addressing Parliament in this way. Pleased to hear the stove is to be removed. Great need for a weather theory. Regarding the identities of the Thomas Streets.

27 September 1865 Sender: Augustus de Morgan Reference number: HS/6/381

Autograph letter signed by sender. Regarding the identity of J. P. [W. S.] Jevons. Hopes John Frederick William Herschel will now set to work on the Odyssey. Sends four riddles.

19 December 1865 Sender: Augustus de Morgan Reference number: HS/6/382

Copy of a letter. Longs to hear from Augustus De Morgan; comments on John Frederick William Herschel's health and on the weather.

5 April 1865 Sender: John Frederick William Herschel Reference number: HS/24/103

Copy of a letter. On concept formation.

4 July 1865 Sender: John Frederick William Herschel Reference number: HS/24/115

Copy of a letter. About old friends, alive or dead; comments on a puzzle in probability; returns to John Frederick William Herschel's old haunts.

14 September 1865 Sender: John Frederick William Herschel Reference number: HS/24/119

Copy of a letter. Comments further on probability [see John Frederick William Herschel's 1865-9-14]; John Frederick William Herschel's daughter Maria is to be married; fills letter with much nonsense.

25 September 1865 Sender: John Frederick William Herschel Reference number: HS/24/120

Copy of a letter. Comments on a mathematics paper Augustus De Morgan sent. Inquires about W. S. Jevons. Is still working on translation of the Iliad.

14 December 1865 Sender: John Frederick William Herschel Reference number: HS/24/135

1866

Sir John Herschel publishes his translation of Homer’s Iliad

1866

Autograph letter signed by sender. Has not heard from him for a long time; hopes his health is still good. Was sorry to hear of the death of Whewell. Sends a proof that has been puzzling him for a long time, and a French riddle.

1 April 1866 Sender: Augustus de Morgan Reference number: HS/6/383

Autograph letter signed by sender. Considers John Frederick William Herschel's account of his own health tolerably good. The Odyssey will set him up entirely. Sends proof of one of his theorems. New professorship of International Law. Should jot down biographical details of William Whewell for the Royal Society [of London]

11 April 1866 Sender: Augustus de Morgan Reference number: HS/6/384

Autograph letter signed by sender. Thanks for letter. Has just turned 60 himself. Does not like the sound of the bronchitis. Wife thanks him for the pamphlet on Force. It is a dreadful puzzle. Philosophers must deny the existence of things they do not understand. Family members are at Walmer. Gives examples of mistakes being copied. Encloses two riddles.

17 August 1866 Sender: Augustus de Morgan Reference number: HS/6/385

Autograph letter signed by sender. Thought that John Frederick William Herschel and Charles Babbage were of the same year, but Cambridge Calendar shows differently; can John Frederick William Herschel solve the puzzle? Visited H. Crabb Robinson yesterday who gave him some sonnets that had been addressed to Wordsworth. Regarding the 1st edition of the Eikon basilike. Reason for Sir James South's knighthood.

31 August 1866 Sender: Augustus de Morgan Reference number: HS/6/386

Autograph letter signed by sender. Returns his letter. Recommends a biographical dictionary by Charles Hale. Paradoxes connected with theology are endless.

3 September 1866 Sender: Augustus de Morgan Reference number: HS/6/387

Autograph letter signed by sender. Tells a story of the translation of Arabic by Englishman who turned out to be Richard Baily, the brother of Francis. Where is it set forth that a leech is a barometer? What is the truth about the relations between Charles Babbage and James South? Has he a catalogue of Ulugh Beg?

27 September 1866 Sender: Augustus de Morgan Reference number: HS/6/388

Autograph letter signed by sender. Many thanks for his book [Familiar Lectures], which he is reading from the beginning. Comments on John Frederick William Herschel's views. Is Sidees a star or a constellation? Congratulations on his completion of Homer. Everyone is translating Homer now, and gives one of his own examples.

22 November 1866 Sender: Augustus de Morgan Reference number: HS/6/389

Copy of a letter. Comments on John Frederick William Herschel's health, the death of William Whewell, and extended comments on a mathematical proof provided by Augustus De Morgan [see Augustus De Morgan's 1866-4-1].

10 April 1866 Sender: John Frederick William Herschel Reference number: HS/24/152

Copy of a letter. Comments on John Frederick William Herschel's health, and on items that are to go into John Frederick William Herschel's Familiar Lectures.

12 August 1866 Sender: John Frederick William Herschel Reference number: HS/24/162

Copy of a letter. Comments on Charles Babbage's entry into Cambridge; strange stories from old letters.

1 September 1866 Sender: John Frederick William Herschel Reference number: HS/24/165

Copy of a letter. Complains about Arabic star names; comments on squabble between Charles Babbage and James South.

9 October 1866 Sender: John Frederick William Herschel Reference number: HS/24/171

1867

Sir John Herschel publishes Familiar Lectures on Scientific Subjects

1867

Autograph letter signed by sender. How is he during this spell of cold weather? Gives reason why he resigned from the College. Gives a theorem. Has no news of his own successor at the College.

25 March 1867 Sender: Augustus de Morgan Reference number: HS/6/390

Autograph letter signed by sender. Has heard a rumor that he is not well. One of his daughters has been recuperating at Hastings. Sends a paradox. Comments on the editing of Isaac Newton's book on Daniel by Benjamin Smith, his nephew. Royal Society [of London] has produced Vol. 1 of the list of scientific papers. Blaise Pascal affair is in a lull.

10 April 1867 Sender: Augustus de Morgan Reference number: HS/6/391

Autograph letter signed by sender. Sends a theorem, which beats Blaise Pascal's by points.

20 April 1867 Sender: Augustus de Morgan Reference number: HS/6/392

Autograph letter signed by sender. The theorem is one of the consequences of the Julius Plücker system. Comments on John Frederick William Herschel's proposed method.

12 May 1867 Sender: Augustus de Morgan Reference number: HS/6/393

Autograph letter signed by sender. Many thanks for the Latin translation of Frederick Schiller's poem. Comments on various points of poetry. Further about the Pascal-Newton letters. Regarding William Pearson and the founding of the Royal Astronomical Society

8 August 1867 Sender: Augustus de Morgan Reference number: HS/6/394

Autograph letter signed by sender. Further concerning the Newton-Pascal letters. Comments on the various line endings for poetry. Why in Runic Almanacs the days of the week begin with Monday.

15 August 1867 Sender: Augustus de Morgan Reference number: HS/6/395

Autograph letter signed by sender. Regarding David Brewster and the inaccuracies in his life of Isaac Newton.

29 August 1867 Sender: Augustus de Morgan Reference number: HS/6/396

Autograph letter signed by sender. In one of John Frederick William Herschel's letters he mentions a name of a forger; was it G. B. Libri? It would not be easy to detect a forgery.

7 September 1867 Sender: Augustus de Morgan Reference number: HS/6/397

Autograph letter signed by sender. Further points on the Michel Chasles forgeries.

9 September 1867 Sender: Augustus de Morgan Reference number: HS/6/398

Autograph letter signed by sender. T. A. Hirst is trying to get Michel Chasles to give up his authority.

18 September 1867 Sender: Augustus de Morgan Reference number: HS/6/399

Autograph letter signed by sender. His son George has died and was buried yesterday. Wife is bearing up well. Is ready to assent to the publication of the song.

18 October 1867 Sender: Augustus de Morgan Reference number: HS/6/400

Autograph letter signed by sender. Has managed to write out the song and insert the Blaise Pascal verse. Gave some advice to an Assurance Office yesterday, so he must be improving. Illness in his family this season has taken the form of great prostration. Gives curious confirmation of Isaac Newton's lack of knowledge of French. Blaise Pascal affair is growing into an epic.

23 October 1867 Sender: Augustus de Morgan Reference number: HS/6/401

Copy of a letter. Comments on mathematical comments Augustus De Morgan has sent John Frederick William Herschel; John Frederick William Herschel is sorry to see Augustus De Morgan has retired from his professorship; comments on the hard winter.

20 March 1867 Sender: John Frederick William Herschel Reference number: HS/24/191

Copy of a letter. Comments on Augustus De Morgan's theorem [see Augustus De Morgan's 1867-4-20].

25 April 1867 Sender: John Frederick William Herschel Reference number: HS/24/193

Copy of a letter. Requests Augustus De Morgan send John Frederick William Herschel an astronomical drinking song.

16 October 1867 Sender: John Frederick William Herschel Reference number: HS/24/207

1868

Benjamin Disraeli becomes Prime Minister

1 February 1868

William Gladstone becomes Prime Minister

1 December 1868

Autograph letter signed by sender. John Frederick William Herschel's account of his own health is much better than he hoped for. Has he seen Augustus De Morgan's contribution to English?

30 April 1868 Sender: Augustus de Morgan Reference number: HS/6/402

Autograph letter signed by sender. Reasons why the sun has been so hot recently. Thanks for the paper on the scale. Comments on this. Sends a mathematical problem.

19 August 1868 Sender: Augustus de Morgan Reference number: HS/6/403

Copy of a letter. Comments on a number of mathematical matters, on a book on positivism, and increased sunspot activity.

18 April 1868 Sender: John Frederick William Herschel Reference number: HS/24/215

1869

Jules Verne serializes Twenty Thousand Leagues under the Sea

1869: (Vingt Mille Lieues sous les Mers)

Autograph letter signed by sender. Has not heard from him for a long time. He himself has been suffering with debility. Has done no maths. Is moving at midsummer to a new house at Merton Road.

9 May 1869 Sender: Augustus de Morgan Reference number: HS/6/404

Autograph letter signed by sender. Has been suffering with congestion of the brain. Moved house yesterday.

30 June 1869 Sender: Augustus de Morgan Reference number: HS/6/405

Autograph letter signed by sender. Regarding middle Latin poets and similar English ones. Hopes John Frederick William Herschel's health improves with the advent of Spring.

15 May 1869 Sender: Augustus de Morgan Reference number: HS/6/405a

Autograph letter signed by sender. Health is not good. Is not up to the theory of atoms. Have had broiling heat for many weeks.

26 July 1869 Sender: Augustus de Morgan Reference number: HS/6/406

Autograph letter signed by sender. Is moving slowly. Regarding an edition of William Spence's Mathematical Essays edited by John Frederick William Herschel.

10 September 1869 Sender: Augustus de Morgan Reference number: HS/6/407

Draft letter. Is delighted to see him astride one of his old hobbies. Regarding the edition of William Spence's Mathematical Essays. Only remembers an 1819 one. His own health is not good.

11 September 1869 Sender: John Frederick William Herschel Reference number: HS/6/408

Autograph letter signed by sender. Regarding a correction to Francis Baily's epitaph. Health is improving slowly.

26 September 1869 Sender: Augustus de Morgan Reference number: HS/6/409

Autograph letter signed by sender. Regarding a mistake in his old address. Hopes U. J. J. Leverrier will arrive safely after all. Cold weather is bracing him up.

20 October 1869 Sender: Augustus de Morgan Reference number: HS/6/410

Autograph letter signed by sender. U. J. J. Leverrier arrived safely yesterday. Michel Chasles has a terrible time ahead of him. Cold weather is doing him good.

22 October 1869 Sender: Augustus de Morgan Reference number: HS/6/411

Autograph letter signed by sender. Kept indoors by the rain, so returns U. J. J. Leverrier with many thanks. Regarding Michel Chasles and the Pascal forgeries. Has lost his friend G. B. Libri. Had a visit from Robert Turner over the Pascal affair.

8 November 1869 Sender: Augustus de Morgan Reference number: HS/6/412

Copy of a letter. On Augustus De Morgan's and John Frederick William Herschel's illnesses; asks Augustus De Morgan about Latin verses of the medieval period.

11 May 1869 Sender: John Frederick William Herschel Reference number: HS/24/258

Copy of a letter. About Augustus De Morgan's health and the cold summer.

1 July 1869 Sender: John Frederick William Herschel Reference number: HS/24/273

Copy of a letter. Concerned about Augustus De Morgan's health. Offers theory of the constitution of matter.

22 July 1869 Sender: John Frederick William Herschel Reference number: HS/24/274

Copy of draft letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. Is delighted to see him astride one of his old hobbies. Regarding the edition of William Spence's Mathematical Essays. Only remembers an 1819 one. His own health is not good.

11 September 1869 Sender: John Frederick William Herschel Reference number: HS/24/279

Copy of a letter. Discusses an exposed case of forgery involving supposed manuscripts of Blaise Pascal and the mathematician Michel Chasles.

15 October 1869 Sender: John Frederick William Herschel Reference number: HS/24/285

1870

Autographed letter . Progressing slowly. Knows nothing about C. M. Hall or the whereabouts of his telescopes. Regarding the London Institution. Sees that U. J. J. Leverrier has been dismissed.

15 February 1870 Sender: Augustus de Morgan Reference number: HS/6/413

Autograph letter signed by sender. John Frederick William Herschel's letter lays terrible responsibilities at his door. Should not neglect the offer. Regarding the Julian calendar.

13 April 1870 Sender: Augustus de Morgan Reference number: HS/6/414

Autograph letter signed by sender. Is creeping along slowly like Alcuin's snail. Curvers are very curious. Informs him where there is an account of Coca. Comments on this as a tonic.

25 June 1870 Sender: Augustus de Morgan Reference number: HS/6/415

Autograph letter signed by sender. Thanks for his enquiry, but has no energy for conundrums at the moment. Finds he has a tendency to tumble as his strength returns.

29 October 1870 Sender: Augustus de Morgan Reference number: HS/6/416

Autograph letter signed by sender. Introducing an uncle-in-law who is residing at the Cape for health reasons. Normally lives at Madras and may prove useful to John Frederick William Herschel should he visit Madras.

Sender: Augustus de Morgan Reference number: HS/6/417

Autograph letter signed by sender. Sending various tracts and a miscellaneous collection of lives. Would he look at the life of William Herschel and make any alterations or corrections as he sees fit.

Sender: Augustus de Morgan Reference number: HS/6/418

Autograph letter signed by sender. Sending an algebraic problem and its solution.

Sender: Augustus de Morgan Reference number: HS/6/419

Autograph letter signed by sender. Pointing out an error in one of John Frederick William Herschel's definitions in the treatise on sound.

Sender: Augustus de Morgan Reference number: HS/6/420

Autograph letter signed by sender. Saw W. S. Stratford yesterday. Has everything ready. Richard Sheepshanks will assist with the pendulums. If he wants more on the interest works, write and he will send a complete list.

Sender: Augustus de Morgan Reference number: HS/6/421

Autograph letter signed by sender. Regarding a citation for J. W. Lubbock's award.

Sender: Augustus de Morgan Reference number: HS/6/422

Autograph letter signed by sender. Regarding the task of sorting his books. All W. H. Smyth's daughters are married; wait until the last one of John Frederick William Herschel's is married. Has had a letter from W. R. Hamilton. Heat has been dreadful.

Sender: Augustus de Morgan Reference number: HS/6/423

Autograph letter signed by sender. Regarding John Frederick William Herschel's new theory of perspective.

Sender: Augustus de Morgan Reference number: HS/6/424

Detached postscript of a letter, autographed. Regarding a proof of L. A. J. Quetelet and the proposition that arises from it. Wife is nursing her mother.

Sender: Augustus de Morgan Reference number: HS/6/425

Detached postscript of a letter, autographed. Anne Sheepshanks would like John Frederick William Herschel's copy of Richard Sheepshanks's pamphlet in answer to James South and Charles Babbage, to bind with other things and return it to John Frederick William Herschel.

Sender: Augustus de Morgan Reference number: HS/6/426

Detached postscript of a letter, autographed. Did the German edition of William Herschel's works ever materialize? Was Francis Baily's Synopsis of Laplace's Principal elements of Astronomy published? Gives a query regarding the possibility of the latter.

Sender: Augustus de Morgan Reference number: HS/6/427

Detached postscript of a letter, autographed. Sending some tracts which John Frederick William Herschel does not possess. Elizabeth Baily is rather better, though still weak.

Sender: Augustus de Morgan Reference number: HS/6/428

Detached postscript of a letter, signed by sender. What does he think of [Joseph] Liouville's journal in which 13 of the 14 communications are by the editor? Sends another riddle.

Sender: Augustus de Morgan Reference number: HS/6/429

Autograph letter signed by sender, incomplete. Sends a sonnet to express thanks for one of John Frederick William Herschel's books. Regarding an answer to S. J. Loyd (1st Baron Overstone). Mr. Vaughan and the question of gold.

Sender: Augustus de Morgan Reference number: HS/6/430

Autographed letter, incomplete. Sending proposed prospectus for a 'fun2y algebra.'

Sender: Augustus de Morgan Reference number: HS/6/431

Autographed letter, incomplete. Sending proposed prospectus for a 'fun2y algebra.'

Sender: Augustus de Morgan Reference number: HS/6/432

Copy of a letter. Asks Augustus De Morgan's advice on an application John Frederick William Herschel received the previous day. Comments on John Frederick William Herschel's health.

2 April 1870 Sender: John Frederick William Herschel Reference number: HS/24/302

Copy of a letter. Writes about John Frederick William Herschel's health; justifies writing by sending some curves prepared by John Frederick William Herschel's son Alexander.

17 June 1870 Sender: John Frederick William Herschel Reference number: HS/24/319