
Book TL | | of Trunks. 
eent to the Wood, and in Spring, in or through the Wood it felf and 
there only. ie 
6. § THE THIRD Part in which the Sap afcends, is the 
Barque, a8 was above hinted, and may be observ’d in almott any 
Branch, if cut crofs, in the late Spring and in Summers either 2s the 
Sap iffueth {pontaneoufly, or upon prefling, as aforefiid. $0 that 
when the Sap ceafeth to afcend, fib forma liquoris, by the Wood, then 
it begins to afcend by the Barque. 
7. §. Belides the difference of Time, the Organical Parts likewile, 
in which thefe two saps afcend, are divers. For in the Barque, it 
afcendeth zfibly, only in the Succiferous, 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 tale it generally, it properly 
enough expreffes, The eruption of the Sap out of any Veffels. 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, ot other Tas. At 
which time, the Veféls alfo, in the Barque of a Vine-Branch, do Bleed 
a Sower Sap. 
9. §. But that which is amlearly called Bleeding, as in a Vine, is 
quite another thing ; both asto the Liquor which iffueth, and the Place 
where it iffues ; that is to fay, it is neither 4 Sweet, nor Sower, but 
Laftelefi saps iffaing, not from any Veffels in the Barguée, but from 
the Aer-Vefféls in the Wood. So that there is as much difference bee 
twixt Bleeding in a Pine, or the Rifing of the Sap in atty other Tree, 
in Marchand in Fuly; as there is betwixt Salvation and an Hemorrhage s 
or betwixt the Courfe of the Chyle in the Laitiferons feffels, and the 
Circulation of the Blood im the Arteries and Peins. ‘ 
to. §. NOW the Caufé from whence it comes to pafs, that the 
early Spring-Sap of a Vine, and other Trees, afcendeth by the sod, is, 
In that the Generation of the young Sap.Veféls in the Barque , by 
which the Sapafcendeth all the Summer 5 is, in the beginning of Spring, 
but newly attempted. So that the Sap having’ not yet thefe/’e/éls to 
receive it, it therefore ( pro hac vice) runs up the Aer-Vefels in 
the Wood. But {0 foon as the faid Vefels'in the Barque begin to be con- 
fiderably encreafed, the Sap, declining the Aer-Vefels, betakes it {elf to 
Thefé, asits moft proper Receptacles. ' 
11. § THE CAUSE alfo, why the Veffels of almoft all 
Plants, upon cutting, do yield sap, or Bleed 5 is the Preffure which the 
Parenchyma 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- 
{tance of the fame Nature, and-have a fomewhat like ftru@ure. As 
alfo from Cork, which is but the Pareschyma or Barque of a Tree. I fay 
therefore, that the Parenchyma being fill'd and fwell’d with sap, hath 
thereby a continual Cozatus to dilate it felf; and in the fame degree; 
to prefs together or contrat the eels which it furroundeth. And 
the faid Vefels being cut, their a@ual Contrafion and the Evuption of 
the Sap, do both immediately follow. 
12. §. IT may bealfo noted, That the Trazk or Branch of any Plant 
being cut, it always bleeds at both ends, or upwards and serie 
alike 

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