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Show The Vegetation -—“-BookIIL. a alike freely. Which, as well as divers other Experiments plainly fhews, That in the Sap-Fefels of a Plant, there are no Falves. 13. §. FROMwhat we have nowabove,and elfewhere formerly faid, we mayalfo underftand the manner of the Ajcent of the Sap. As to which, I fay, Firfi, That confidering to what heigth and plenty, the Sep fometimes afcends; it is not intelligible, how it fhould CLHVA.P. neither by virtue of the Parenchyma, nor by virtue of the Veffels, alone. Not by the Parenchyma alone. For this, as it hath the Na- SScle «Ss HE NEXT enquiry to be made, is, into the S\} Motion and Courfe of the Aer. Where this queftion will firft ofall be asked 5/e. Which way ture of a Sponge or Filtre, to fuck up the Sap; fo likewife, to fuck it up but toa certain heigth, as perhaps, about an Inch, or two, and Nor bythe Vefels alone, for the fame reafon. For all- the Aer firft enters the Plant; whether at the though we fee, that {mall Gla/s-Pipes immerfed in Water, will give it an afcent for fome Inches 5 yet there is a certain period, according to the Lore of the Pipe, beyond which it will not rife. We muft therefore joyn the Veffels and the Parenchyma both together in this Service 5; which we mayconceive performed by them in the manner following. 15. §. Let A B bethe Veffel of a Plant. Let CED be the Bladders of the Parenchyma, wherewith, as with fo manylittle cifferns, it isfurrounded. [ fay then, that the Sap, in the Pipe BA, would, of it felf, rife but a few Inches 5 as fuppofe, from DtoL. But the Bladders DP, which furround it, being {welled up and turgid with Sup, do hereby prefs upon it; and fo not only a little contract its bore, but alfo transfufe or ftrain fome Portion of their Sap thereinto: by both which means, the Sap will be forced to rife higher therein. And the faid Pipe or Vefel being all along furrounded by the like Bladders; the Sap therein, is ftill forced higher and higher: the Bladders of the Parenchyma being, asis{aid, fo many Cifferns of Liquor, which transfufe their repeated Supplies throughout the length of the Pipe. So that by the fupply and preffure of the Cifferns or Bladders F D, the the Sap rifeth to L; bythe Bladders Q_L, it rifes to M3 by the Bladders N M, it rifes to 15 by the Bladders OI, it rifes toK 5 by the Bladders PK, it rifestoE; and fotothe top ofthe Tree. far of the Motion of the Sap. And thus Ik Of the Motion and Courfe of the Aet. thus afcend, by virtue of any one Part of a Plant, alone3 that is no more. 14. §. $a ( ; Trunk, Leaves, and other Parts above ground 5 orat the Root ? Lanfwer, That it enters inpart, at them all. Forthe Reception, as well as Extra2528 miffion whereof, the Pores are fo very large, in the Truxks of fome Plants, asin the better fort of thick walking Canes, that they are vifible, to a good Eye, withouta Gia/s 5 but with a Glos, the Cane feems, asif it were ftuck top Tab, 19. full of holes with great Pins : being fo large, asvery well to tefemble a Pores of the Skiz in the end of the Fingers and Ball of the and. 2. §. Inthe Leaves of Pine, they are likewife through a Gla/s, a very Elegant Show 3 ftanding all moft exa@ly, in ravk and file, throughout the length of the Leaves. The Figure whereoffhall’ be given hereafter, when we come to the Anatomy of the Leaf. 3. §. But although the Aer enters, in part, at the Tr#zk and other Parts, efpecially in fome Plants; yet its chief entrance, is at the Root. Evenas {ome Parts of Aer, may continually pafs into the Body and Blood, by the Habit, or Pores of the Skins but the chief entrance hereof, is at the Mouth. And what the Mouth is, to an Animals that the Root isto a Plant. 4. §. Again,if the chief entrance of the Aer,were at the Trunk; then, before it could be mixed with the sap in the Root, it mutt defcend ; and fo move not only contrary toitsown Nature, but likewife in a contrary Courfe to the Sap, throughout the Planxt. Whereas, byits Reception at the Root, and {0 its Tranfition from thence 5 it hath a more natural and eafie motion of Afcent. For while the Sap afcends, that the Aer, in the fame Plant, fhould continually defcend, cannot reafonablybe fuppofed. 5- §. The fame is further argued, From the fewnef$ and {mall- nefs of the Diametral Portions in the Trunk in comparifon with thofe in the Root. In which Nuture hath plainly defigned the fame, for the Separation of the Aer from the sap,after they are both together received thereinto. So that the Receptioz and Courje of the Aer, is made on this mannerfollowing. 6. § THE er beinga Springy Body, it infinuatesintoall the Holes and Cranies of the Earth; and fo is plentifully mixed therewith. Whereupon, asthe Sap entersthe Rost, more-or lefs Aer {till intrudes it felf together withit. The Liguid Portion of the sap, fwells and fills up the Succulent Parts of the Barque. The Aery Part, is, as was faid, (eparated from the Liquid, into the Diametral Portions, Which running |
