3, 
/ 
Book HL of Trunks. 
125 
cent tothe Wood, and in Spring, in or through the Wood it felf, and 
there only. 
6. § THE THIRD Part in which the sap aftends, is the 
Barque, as was above hinted, and may be observ’d in almoft any 
Branch, if cut crofi, in the late Spring and in Summer 5 either as the 
Sap iffueth fpontaneoufly, or upon prefling, as aforefäid. So that 
when the Sap ceafeth to alcend, fub forma liquoris, by the Wood, then 
it begins to afcend by the Barque. 
7. $. Befides the difference of Time, the Organical Parts likewife, 
in which thefe two saps afcend, are divers. For in the Barque, it 
afcendeth zifbly, only in the Succiferons, whereas in the Wood, it 
afcendeth only by the Aer-Veffels. 
8. $. FROM what hath been faid, we may underftand, what is 
meant by the Bleeding of Plants. If we take it generally, it properly 
enough exprefles, The eruption of the Sap ont of any Veffls. And fo, 
almoft all Plants, in Summer time, do Bleed, that is, from Sap-Veffels, 
either in the Barque, or in the Margin of the Pith: the saps they 
Bleed, having either a Sower, Sweet, Hot, Bitter, or other Taff. At 
which time, the Veffels alfo, in the Barque ofa Vine-Branch, do Bleed 
a Somer Sap. 
9. $. But that which is zulgarly called Bleeding, as in a Vine, is 
«quite another thing ; both as to the Liquor which iflueth, and the Place 
where it iffues :- that is to fay, it is neither a Sweet, nor Sower, but 
Taftelfs sap 5 iffaing, not from any Yeffels in the Barque, but from 
the Aer-Vefels in the Wood. So that there is as ‘much difference be- 
twixt Bleeding in a Pine, or the Rifivg of the Sap in any other Tree, 
in Marchand in July as there is betwixt Salivation and an Hemorrhage 3 
or betwixt the Courfe of the Chyle in the Ladfiferous peffls, and the 
Circulation of the Blood in the Arteries and Feins. 
10. $. NOW the Caufe from whence it comes to país, that the 
early ee ofa Vine, and other Trees, afcendeth by the Wood, is, 
In that the Generation of the young Sap.Veffels in the Barque, by 
which the Sap aftendeth all the Summer ; is, in the beginning of spring, 
but newly attempted. So that the Sap having not yet thele Meféls to 
receive it, it therefore ( pro hac vice) runs up the Aer-Veféls in 
the Wood. But fo foon as the faid Veffls in the Barque begin to be con- 
fiderably encreafed, the Sap, declining the Aer-Vefels, betakes it felf to 
Thefe, as its molt proper Receptacles, 
11. $ THE CAUSE alfo, why the Vefels of almoft all 
Plants, upon cutting, do yield Sap, or Bleed 5 is the Preffure which the 
Parcnchyma makes upon them. For the Pith and other Parenchymous 
Parts ofa Plant, upon the reception of Liquor, have always a Conatus 
to dilate themfelves. Asis manifeft from Sponges, which are a Sub- 
ftance of the fame Nature, and have a fomewhat like ftru@ure. As 
alfo from Cork, which is but the Parenchyma or Barque of a Tree. Ifay 
therefore, that the Parenchyma being fil'd and fwell’d with sap, hath 
thereby a continual Conatus to dilate it felt; and in the fame degree, 
to pref together or contract the Veffels which it furroundeth. And 
the faid Yeffels being cut, their actual Contrattion and the Eruption of 
the Sap, do both immediately follow. 
12. $. IT may bealfo noted, That the Trunk or Branch of any Plant 
being cut, it always bleeds at both ends, or upwards and downwards, 
alike 
