wounded in November last & not to have shewed any signes of moisture <s>at those old wounds <\s> for yt very cause, yt they were not fresh struck at bleeding times. Concerning ye bleeding of poles & entire branches held perpendicular, Mr Willoughby is in right & some expts in my last to you of 17th of March confirme it. Yet is it very true what I observe though ye cause I did not than well take notice of, when I first made ye expt & sent you an account of it. For I held ye twiggs, wch I had cut off a-slop, joining & holding up ye cutts to gather in my left hand that I might ye better observe wch part or cut would bleed or not bleed or bleed ye faster; & because I found yt ye cut of ye separated Twigg did not in yt posture (holding it upwards, as I said, for ye ad- vantage of my eye) did not bleed at all, when as ye cut of ye branch remaining to ye Tree did freely bleed; I thrfore inverted ye separated Twigg & held it perpendicular wth ye cut end downward & found yt ye little they were exposed to ye aire in an upright posture had soe very much checked ye motion of ye sap, yt I concluded they would not bleed at all, & yet striking of their topps & making poles of ym, I found some of ym, if not all I chanced to try, as I remember would shew moisture; but I am convinced since, yt it was rather some unheeded accident, as violently bending ym or phapps ye warmth of my hand & person or place, wch caused this new motion of sap, than mierly ye striking off the topps. I have sent you enclosed a <u>Pustillus<\u> of some fine grains of <u>English black <\u>, as I call it, wch was all what ye season would yet well afford me: ye Expt I made long since upon an other occasion & purpos but upon ye question of ye usefullnesse of it as to its dye, in this late repeating of it I found, yt ye plant does not afford a mealy substance such as Indigo is & ye <u>ferulas <\u> of Bryonie burne wth a very quiet & lasting flame. The Expt is accompanied wth circumstances of good light in order to ye further discovery of ye natures of vegetable juices, wch is ye only reason, yt I am back ward to name ye plant to you at present, but soe farr as ye businesse of colours may be improved by it I shall willingly impart & shew upon ye first opportunity to ye R.S. I doubt not but by ye few graines I send you, there may be persons of yor acquaintance, yt may tell me more of it, yn I understand at least undeceive me if I be in an erour. Whilst liquid it is a most exquisite black & staines accordingly any thing it touches; & neither Time nor a strong Lye of pot-ashes does in ye least, yt I can discerne, alter it.
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Martin Lister, dated at Petworth, to Henry Oldenburg, 1722. From The Royal Society, EL/L6/29
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