OCR Text |
Show Book II. 86 Book IF. n Of ibe Vegetatio ee Eee that Plant. For befides Water, and Earth, an Alkaline Salt and Oy! are, Ie is then the Oyl, chiefly, by which thefe Ve/fels are Tough: for being of a tenacious Nature, bytaking hold ofother Principles, it marries them together5 and the Alkaline Salt and Earth, concentred with it, addeth to it more Strength. Hence the Caput Mortum of molt Bodies, efpecially (a) $216 as is faid, the predominant Principles ofthefe Veffels. (4) thofe that abound with Oyl and a Sal Alkali, is brittle and friable 5 thofe Prixciples, which were the Ligaments ofthe reft, being forced away fromthem. From the fame Caufe, the Parenchymous Parts of a Root, even in their Natural State, are britile and friable; fc. Becaufe and Saline Principles are, as is faid,() (b) $. 19. their Earthy, and efpecially Oleows fo very few. Therefore all Piths and more fimple Parenchyma's, break short 5 fo Cory, and the Roots of Potato’s, and divers other Plants, being dryed, will eafily be rub’d to Meal s and many Apples, after Frofts, eat mealy 5 the Parenchymous Parts of all which, are not only (e) Lib. 1. bY Analogy, but in Subftance or Effence, the felf fame Body. (¢) 31. §. And asthe Confijtence ofthe feveral Organical Parts, is de0.7. $s 14. pendent on their Principles; {0 are their Figures. And firft, the Succiferous Veffels, from their Alkaline Salt, (d) growin Length, For ie Fi 20$s by that Dimenfion, chiefly, This salt always fhoots: And being lefs 21. esNa ramet TTT moveable Principle than the reft, and fo apt more fpeedily to fix or fooot : It thus overrules them to its own Figure. And even as the Shape of a Buiton dependeth on the Mozld, the Sik and other Materials wrought upon it, being always conformable thereunto: fo here; the salt is, as it were, the Mould; about which, the other more paffive Principles gathering themfelves, they all confort and fafhion to it, Hence alfo the fame Sap Veffels are not pyramidal, asthe Veins of Animals ; but of an equal bore, from end to end; the fhootings of the faid Sait, being alfo figured more agreeablyto that Dimenfion. And as by the Saline Principle, thefe Vefféls are Long 5 fo by the Oleous, (e) they are every where Round, or properly Cylindrical; without fome joynt Efficacy of which Principle, the {aid Veffels would be Fiat, or fome way Edged and Avgular, as all faline fhoots, of themfelves, are 5 as thofe of Alum, Vitriol, Sal Ammoniac, Sea Salt, Nitre, &c, And becaufe the Spirituous and more Fluid part of the Principles, is leatt of all apt to fix 5 while therefore, the other parts fix round about, This will remain moveable in the Cevtre 5 from whence every Veffelis Aer-Veffels, 1 fappofe, are crooked: and that by compofition of many **7** of thofe crooked ones together, fome of them becomeSpiral, or of fome other winding Figure: and that thereupon dependeth the Elzftick, Property of the Aer, or its being capable of Rarefadiiow and Condenfation by force. Wherefore, the faid crooked Particles of the Aer, firtt hooting and fetting together, as the Mould, the other Principle cling and ix conformably round about them. So that, as by +force of the Saline Principles, the re{t of them are made to hoot out in Long continued Fibres, fo by force of the Aerial, thofe Fibers are {till difpofed into spiral Lines, thus making up the Aer-Vefels. And according as there are fewer of thefe Aerial Particles, in proportion to the Saline, the Concave of the Aer-Veffels is varioufly wider,or the F7bres continue their fhooting by wider Rings; as thofe that come nearer to aright Line, and fo are more complient to the Figure and fhooting of the Salve parts. And whereas the Lympheduéés, thooting out o1ly inlength, arenever fenfibly amplified beyond their original fize : Thefe, onthe contrary, always, more or lefs, enlarge their Diameter ; becaufe their Fibres, being difpofed into Spiral Lines, mult needs therefore, as they continue their growth, beftill dilated into greater and greater Rings. And being at the bottom of the Root more remote from the Aer, and fo having fomewhat fewer Particles purely Aerial, there ingredient to them, then at the top; theyfall more under the government of the Szline, and fo come nearer to aright Line, thatis into greater Circles; and fo the Aer-Vejels, made up of thofe Circles, are there generally. wider. () Ch) Pca 34. §. By mediation of their Principles, the Parenchymous Parts §.16. likewife of a Root have their proper Covtexture. For from their Acid Salt they are Fibrous; from their Oy/, the Fibres are Round, and in all parts even within themfelves 5 and from their spirit, it is moft probable, that they are alfo hollow. But becaufe the Spirit is, here, more copious than the Aer; and the Saline Principle an Acid, (c) (c) $.19. and fo, more under the government of the Spirit, than is an Alkali; therefore are not the faid Fibres continued in firaight Lines, as the Sap-Veffls 3 or by one uaiform motion, into /piral lines, as the Fibres in the Aerjal; but winding, ina circular manner, to and fro a thou- fandways, agrecable to the like motions of the Spirit, that moft aéfive, and here molt predominant Principle. And the Spirituous Parts being, formed, not into a folid, but hollow Cylinder; thatis, becomes a as is faid, here more copiousand redundant, they will not only fut- fice to fill up the Concaves of the Fibres, but will alfo gather toge- are: they are therefore more tender, and fo moreeafily dilative, and yielding to the faid spirituous part in the Centre. And by this means, obtaining a wider Bore, they are more adapted to the free motion of the Milky Content: which being an Oleous and Thicker Lignor, than that in the Lywphedudts 5 and having no advantage of pulfation, as the Blood hath in Aximals, might fometimes be apt to ftagnate, if the Veffels, through which it moves, were not fomewhat wider. 33. 6. ii) Asthe Saline Principle isthe Mould of the Succiferons, fo is the Aerial of the Aer-Veffels. (a) Now the Particles of Aer ftriGtly fo (4) P.1.0.4: called, at leaft of that part of it concerned inthe Generation of the *:23-& P.2. Tube. 32. §. The Laiiferous Veffels are tubulary, as the Lympheduds, but of a fomewhat wider Concave or Bore. For being their Principles are lefs Earthy and Oleous, and alfo more loofely Concentred 5 as fromtheir eafie corruption or Refolution by the Aer, it appears they | i HeWhy iatFAUT | 33. §. of Roots. ther into innumerable little {paces, without them: whence the Fi- bres cannot wind clofe together, as Thred, in a Bottom of Yarn 5 but are forced to keep at fome diftance, one parcel from another, and (@) Pitieg. fo are difpofed, as Bread isin baking, into Bladders. (d_) 35. §. And the wxder Fibres being Jet firft, as the Warp, the /pi- §, 4. rituous parts next adjacent, willincline alfoto fix, and fo govern an over work of Fibres, wrapping, as the Woof, in ftill fmaller Circles round the other: whereby they are all knit together. (¢) For the (e) P.1..05; ys 9? fame reafon, the Lympheduds, being firt formed, the Parenchymons CfDP 1e.52 Fibres fet and wrap about Thefe alfo. (f) And the Aen af being ia: orme |