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Show The b/egetation Book IIL ints, the Pith doth moreeafilytear, and upon tearing 1 {fo become hollow : as in Cichory, Lamplana, Sonchus, and others; wherein the Pores of the Pith are n les of the Pores, Thin. Whereas, upon contraryac- counts, the Piths of moft Trees, remain perpetuallyentire. s 8 §. THE Reafon why Plants are made thus to become hollow, is partly, for the ripening of the Fruit or Seed 5 which is the better ef fected by a more plentiful fupply of Aer continually received into their hollow Trunks, For by means of that A r, part of the Sap, isdryed up, and the remaining part of it made warmer, andfo fooner matured. 9. §. Partly, for the better determining the due Age of the Plant. Henceit is, that the greater part of Azaual Truks, are hollow: the Aer containedin that hollow, drying up the Sap, andfhrinking upthe Sap-Veffels fo far, asto hinderthe free motionof the Sap therein 3 from whencethe P/avt muf eds perifh. So that as the Content of the Ae jels, is a kind of Vegetable Aer, whofe Officeis to Attenuate, and BF the Fuyces of Plants : fo the Content of thefe Cavities, cometh hearer to amore common der, defigned chiefly, fo foonas it is convenient, to dry them up. : to. §. AGAIN, asto the Aer-Vefels, divers queftions may be d. As howit comes to pas, that theyare generally lefs in the uk of the fame Plant, than in the Root 2 The Caufe whereof is, that here in. the Trw#k they are more under the power of the ders ae both that which entreth in at theTrwak, and that which of its own Nature afcendeth upinto it from the Root. For the Aer, as we have elfewhere {aid,is theMould of the Aer-Veffels 5 to whofe crookedor at leaft, Acid Parts, the salize,and other Principles concurring to their ge- neration, do conform. To which they do beft, the fmaller theyare: the Fbres of the larger Aer-Veffels making greaterCircles, and fo coming nearer to a right Lie, anfwerable to the Figure of the Particles, not of the Aerial, but ofthe saline Principle. ; 11. §. Wherefore as the Aer-Veféls may be obferved ftill tobe dila- ted or widened towards the lower parts of the Root; the Acrial Princi= plebeing there lef predominant, and the Salize more: So towards the upperpart of the Truk, to be contracted or grow f{mallers the Aerial Principle being here more predominant, andthe Saline lef, 12. §. FORthe fame caufe it may be obferved, That the Aer-Veffels of the Second years Growth, and the feveral years fucceeding, are ufually nearerof one Size, than thofe of the Second and Firfts all being undera lefS powerof the Aer, than the Firft. For the firft year the g full of Liquor, the Aer-Veffels themfelves, are the only Repo- fitories of the Aer. Whereasyafterithe firft year, the Pith becoming dry, or another great Repofitory for the Aer; the Aer-Veffeles are filled with a moifter or more Vaporows andSaline Aer, and henceforth fo made to growwider. 13. §. Hence the verySize ofthe Pith, hath muchinfluence upon the 4er-Veffels, and the manner ofNutrition, and the Generation ofLiquors in Plants. 14. § BUT for the mot part, the Aer-Veffels are fomewhat, more or lefs,amplified in every new Aunuat Ring sorat leaft toa certain numberof years. Probably, becaufe in the elder Branches, the Spiral Fibres, of whichthe Veffels confift, are more bulky; and fo make a Veffe! Boo kI. ofTrunky. i 3t ———_____ Veffel of a wider, asa more agreeable bore. Nature obtaining hereby, that the Quantity of Aer, hall always be anfwerable to the Growt h ofthe Plant, orat leaft, be fufficient to maintain its Vegetable Life and Vigour. 15. §. And therefore, as is above hinte d, it ems likely, That after a certain numberof years, the Aer-V effel ftand at a ftay, and perhaps may growf s are no longer amplified, bue maller, according asthe Tree ig lefS or more Longeves and thatafter this period, it is ome wayor other in its Declining State, 16. §. LASTLY, fromthe the Aer-veffels, the Time, when theyContent and Governing Principle of begin every year to be formed, or to appear, is always Jater s at leaft with refpect to the feafen of the Tree. So that whereas the Sap-Veffél s begin to be formed in Spring : thefe, nottill the Jatter end of Summer, or there about; at leaft not till about that time to appear, That creafe, and to grow more Aery; and is, when the Sap begins to defo moref it matte r for the Generation ofthe faid Aer-Vefels, aa CHAP. Iv. Of the Generation of Liquor s: SODA PON the Structure and Forma tion of the Parts, deS pendeth the Generation of.Liquors, as ; i, timated. The wanuer whereof I was lately inhave formerly @ thewed, in difcourfing of the Root, Yet fome things 9 I fhall here further explicate. And Firft, what we have formerly afferted, Je. That the concu rrence of , LW fpecifically diftink Fluids, is as neceffary to Nutrition in Plants, asin Animals. Whic h appears, as from divers other confiderations, fo from the very Strud ure of a Plant: where in all the Organical Parts, or the Payenchyma and the Veffels, are every where mixed together per minima, that is, eas, or Fiber with Fiber of feveral. Kindy. per minimas partes organiTree, or of the Barque of a Tree, being asI Every fmall part of a Woolfey. So that there is not the leaft part mayfay, a fort of Linfjimpregnate with divers Effential Tindures, of the Sap, which is not as it is continually filtred from the Fibres of one Kind, to thofe of where woun'd ‘and ftitch'd up together for another; ftanding every the fame 2. §. FROM the fpecial Nature and Siruéf purpofe, ure of the Parts, the Liquors of Plants are likewife Specified. The vefels being the chief Fifcera ofa Plant. For all Liquors in a Plant, are certainly made by that Plat. Andfince the Plant hath no Vifiera (fo then know, what its feveral Liquors are made by? called) I would chyma, furely by that Parenchyma. If in the Veffels {fin the Paren Andif of divers Kinds by divers Kinds of Veffels , by the Veffels, Vifeera arein Animals, the Veffels themfelves are . So that what the in Plants. Thatis to fay, as the Vifcera ofan Avimal, are but Veffels conglomerated : fo the Vefels of a Plant, are Vifvers drawn out at length. Z 2 3. §. i sual i" ik i i. | 1 MAM ia ae |
