Martin Lister, dated at Petworth, to Henry Oldenburg

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                                (Read April 20:71.
Enter LB.4.268)
Yorke April 8th 1671.
Mr Listers letter to Mr Old,
about ye motion of juices in vegetables, and an English black.
Yours of ye 4th instant came safe to my hands. This last 
month has been a busie time in my private concerns soe yt I have but 
a few things to returne you to what you have been 
pleased to commicate to me in relation to ye further 
discovery of ye motion of juices in vegetables. And 
I must acquaint you yt these notes are above 14? dayes 
old, for I have scarce busied my head or put my 
hand to any Expt of latter date.
One or both ends of ye pith of a Willow pole sealed up 
wth hard wax, will yet freely bleed by ye warmth of ye Fire:
this was tryed when ye last experiments I sent you were 
& I thinke, omitted.
March 23d was ye greatest frost & snow we have had 
this winter in these parts about Yorke. Some twiggs 
& branches of ye very same willow Tree as formerly and likewise of 
many other Willow Trees taken off this morning March 23d 
when brought within ye aire of ye Fire would shew noe moisture 
at all; noe not when heated warme & often & long turned.
March 24th ye same willow branches wch yesterday would 
not bleed & were thrown upon ye Grasse Spott all night did both they 
& all others new cut downe by ye Fire side freely shew moisture & bleed 
this morning upon ye breaking up of ye frost.
Ash poles & branches this day nor yesterday would by 
ye fire be noe more moist than when I formerly tryed ym.
The same morning March 23d a Twigg of Maple, wch 
had had ye top cut off ye 7 of February last past & wch 
than bledd, this day being quite taken of from ye Tree,
& brought within ye aire of Fire, & held wth ye formerly-
cut-end down wards, did not run at all at yt end, but 
held-on in yt posture it did run apace at ye other non-cutt end 
uppermost soe as to spring & trickle downe
Note, yt this doth well agree wth my Expments made ye 
last yeare at Nottingham, where I observed wounds of some 
months standing to bleed apace at ye breaking up of very hard Frost. For first in these parts 
there hath been noe hard frost this yeare, not comparable to ye last yeare: Again those Nottingham 
Trees I wounded in ye Trunke & they stood against a brick wall & ye wounds were on ye side next 
it, & besides had horse-dung stopped in all of ym for some reasons, wch things did undoubtedly 
disfend ym much from ye aire & winds & keep ye wounds still green & open. Wheras ye topps 
of these Maple twiggs spoake of in ye last expt were exposed in an open hedge to ye aire 
& winds as alsoe ye 2 sycamores here at Yorke, mentioned in my former Letters, to have been 
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Martin Lister
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Martin Lister, dated at Petworth, to Henry Oldenburg, 1722. From The Royal Society, EL/L6/29



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