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Show TheVegetation Book IIL as was above hinted, and may be observ’d in almoft any Branch, if cut cro, in the late Spring and in Summer 5 either 25 the Of the Motion and Courfe ofthe Sap. y Si IRS T, asto the Courfe of the Sap, there are Three Parts in which it moveth 5 fc. the Pith, the Wood, and the Barque Firft the Pith; in which Wy the Sap moveth the Firft year, and only the Firft Or, it is Proprinm quarto modo, to the Pith aX do of every Aznual Growth, and tothe Pith of fuch a Growth only, To te fuctulent. That is, whetherofa Sprout from , or of a Sucker from a Root, or of a Cyox from a Branch 5 The Pith is always found the Firft year full of Sap. But the Second year, the fame individual Pith, always becomes dry, and fo it continuesever after. 2. §. Onecaufe whereofis, that the Lywpheduds in the Barque, being thefirft year adjacent to the Pith 5 they do all that time, tranffufe part of their Sepinto it, and {0 keep it always Succulent. But the fame Lympheduéts, the year following, are turned into Wood; and the Vefféls which are then generated, and carry the Sap, ftand beyond them, inthe Bargue. So that the Szp being now more remote from the Pith, and intercepted by the new Wood, it cannot be transfuled, with that fufficient force and plentyas before, into the Pith; which therefore, from the firft year, always continues dry. 3. § of Trunks. cent to the Wood, and in Spring, in or through the Woodit felf, and there only. 6. §. THE THIRD Part in which the sap afcends, is the Barque, CoHPAS Et Zp», Book IIL. THE SECOND Part in which the Sap moves, fib for- maliquoris, isthe Wood. Which yet, it doth not in all Plants, but only in fome; and vifibly, in very few 5 asinthe Vize: In a Vine, I fay, the Sap doth vifibly afcend by the Wood. Andthis it doth, not only the firft year, but every year, fo long as the Vize continues to grow. But although this a/cewt, in or through the Wood, be every year yet it is only in the Spring, for about the {pace of a Month; fe in Marchand April. 4. §. There are many other Trees,befides the Vine, wherein, about the fame time ofthe year, the Sap afcendeth, though notfo copioufly, yet chiefly, inthe Wood. For if wetake a Branch of two or three years growth, fuppofe of salow, and havingfirft cut the fame tranfverfely; ifthe Barque be then alfo tranfverfély, and with fome force, prefled with the back of the knife, near the newly cut end; the sap will veryplainly rife up out of the utmoft Ring of Wood. And if it be prefled inthe fame manner, or a little more ftrongly, about an Inch lower, the Sap will afcend out ofevery Ring of woodto the Center. Yet at the fame time, whichis to be noted, there arifeth no Sap atall Out of the Barque. _5: §. Whence appears the Error of that fo Common Opinion, That the Sap always rifeth betwixt the Wood and the Barque. trary whereunto is moft true, That it never doth. The con- For the greater part of the year, it rifeth in the Bargie, fe. in the inner Margin adjacent Sap iffueth fpontancoufly, or upon prefling, as aforeftid. So that when the Sap ccafeth to afcend, fub forma liquoris, by the Wood, then it begins to afcend by the Barque. 7. §. Befides 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 Sueciferous, whereas in the Wood, it afcendeth only by the Aer-Veffels. : 8. §. FROM what hath been faid, we may underftand, whatis meant by the Bleeding of Plants. If wetakeit generally, it properly enough exprefles, The eruption of the Sap out of any Veffels. And fo, almoft all Plants, in Summer time, do Bleed, that is, from Sap-Veffel s, either in the Barque, or in the Margin of the Pith: the Saps they Bleed, having either a Somer, Sweet, Hot, Bitter, or other Tas. At which time, the Yeféls alfo, in the Barque ofa Vine-Branch, do Bleed a Sower Sap. 9. §. But that which is v#lgarly called Bleeding, as in a Vine, is quite another thing ; both as to the Liquor which iffueth, and the Place whereit iffues - that is to fay, it is neither a Sweet, nor Sower, but Taftelefs sap s iffuing, not from any Vefels in the Barque, but from the Aer-Veffels in the Wood. So that there is as much difference betwixt Bleeding in a Pine, or the Rifing of the Sap in any other Tree, in Afarch,and in Fuly; as there is betwixt Salivation and an Hemorrhage 3 or betwixt the Courfe of the Chyle in the Ladhiferous freffels, and the Circulation of the Blood in the Arteries and Veins. to. §. N OW the Caufe from whence it comes to pafs, that the early Spring-Sap of a Vine, and other Trees, afcendeth by the ood, is, In that the Generation of the young $ap-Vefels in the Barque, by which the Sap afcendeth all the Summer ; is, in the beginning of spring, but newly attempted. So that the Sap having not yet thele /e/els to receive it, it therefore (pro hac vice) runs up the Aer-Vefels in the Wood. But fo foon as the faid Veféls in the Barque begin to be confiderably encreafed, the Sap, declining the Aer-Vefels, betakes it felf to Thef, asits moft proper Receptacles, m1. § THE CAUSE alfo, why the eféls of almoft all Plants, upon cutting, do yield Sap, or Bleed 5 is the Preffure which the Parenchyma makes upon them. Forthe Pith and other Parenchymous Parts ofa Plant, upon the reception of Liquor, have always a Conatus to dilate themfelves. As is manifelt from Sponges, which are a Sub{tance of the fame Nature, and have a fomewhat like ftructure. As alfo from Cork, which is but the Parenchyma or Barque of a Tree. I fay therefore, that the Parenchyma being fill'd and {well’d with Sap, hath thereby a continual Covatus to dilate it felf; and in the fame degree, to prefS together or contract the Veféels which it furroundeth. And the faid Vefels being cut, their actual Contraéion and the Eruption of the Sap, do both immediately follow. 12. §. IT may bealfo noted,That the Trask or Branch ofany Plant being cut, it always bleeds at both ends, or upwards and som alike |
