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Show TbeAnatomy ~~Book IIL “118 | Book IIL. of Trunks. ones, = wfaally uvroaved without breaking; thofe fmaller inue eafily tear in funder Co a are pitched or woven together, C\El cA PST: themfelves alfo of a rh And becaufe the Fibres of the Woof, are are more fturdy, different Bulk therefore it is, That where they quantity of Warp, as ufually in the Root , they require a greater , where they that is, a broader Plate, to overmatch them. Whereas Leaves, one Thred of the are more extream fmall, as in the Zru#k and Of the PITH. felf, and Warp, that is, one Spiral Biss, will be ftrong enoughofit jae eR, HE Third General Part of a Branch is the Pith, difficulty they are veryrarely difcern'd, and not without the greateft g to be As alfo, from their great Tendernefs 5 whereby not endurin the drawn out,theyall break off clofe to the Sides of the spiral oves.In firlt which vifible: ners He a are Fibres fe Tranfver like the Pith, ‘ Me to the notice of them here alfo. cond the rare All the Fibres of the Aer-Veffels, both the Warp and with them both. Whereof there is a double evi& dence, fc. their Continuity, and the famenefS of their Texture. Their Texture thall be thewed prefently. imes, be fingly w#roavd. Fibres; it is, That ee eg eam Tenuity of thefe . UBtEe & As to their Continuity, it istobe noted, That asthe shiz is continu- ous with the Parenchyma of the Barque 3 and this Parenchymalikewife, with the Infertioys in the Wood 5 fo thefe Infertions again, running through the Wood,are alfo continuous with the Pith. So that the Shiv, are very Strong and Tough 5 thefe,as is abovefaid, are extream Tender Parenchyma, Infertions, and Pith, are all Oxe entire piece of Work; and Brittle, like thofe of the Pith and all the Pithy Parts. Towhich therefore, the Aer-Veffels are tobe referr'd. And the Content of both, is oftentimes the fame. ‘ ve ¢. From whence, we havea further proof of whatI have §. Wood 5 yet, as to its Subftance, it is the very fame the other Woof, are of the fame Subftantial Nature withthe Pith and Parenchymous Parts of a Plant. From whenceit 1s, That whereas the Towy Parts of a Plant, whereofall Linen Manufatures are made, Boros 7= Which thoughit havea different name from the Parenchyma in the Barque, and the Infertions in the Subformerly afferted , which is, That in all Plants, there are To ftantially different Parts, and no more than Tio, viz. the Pithy, and h i3ntAs the Towy or Lignous Parts. 35. §, From hence alfo we have fome ground to conjecture, That fo manyof the Aer-Veffels, at leaft, which are not formed with the {eed, but poft-nate, are originated from the Parenchymous Parts 3 which feem by fome alteration in the Quality, Pofitioe and Texture of the Fibres, tobe Transformed into Aer-Veffels,as Caterpillars are into Flies. Andas the Pith it felf, by the Rupture and Shrinking up of feveral Rows of Bladders, doth oftentimes become Tubulary: So is it alfo probable, that in the other Parenchymous Parts, one fingle Row or File of Bladders evenly and perpendicularly piled ; may fometimes, bythe fhrinking up of their Horizontal Fibres, all regularly breakone into another and fo make one continned Cavity 5 or a Tube,whofe Diametre is the fame with that of the Bladders, wherofit is compofed. All which, will appear more probable, and what hath been faid, be yet better underftood, when we come, in the next Chapter, to the Defcription of the Pith. being only filled up, in divers manners, with the Vefels. 2. §. The size of the Prthis various, being not the fame in an two Branches here reprefented. In Wormwood, Sumach, Fig, Barbery, Tab. 24, ‘tis very large fe. betwixt 5, and 7 Inches Diametre, as it appears 31,34, 35: through the Microfcope. In Pine, Afh, Holly, Walnut, not fo large; 22, 29, from 3 Inches Diameter to 4. In Oak, Apple, Pear, Hazel, lefler, fcarce 30, 32- from 2,to 3. In Dzmafcene, not above an ach and half. And in El, 23, 255 fearce an Inch Diameter. Note alfo, that of all Plazts, both Herbs, 26, 35. and Shrubs, have generally the largeft Piths, in proportion with the 27- other Parts of the fame Branch, as in Sumach, Fig, Barbery, is ma- 28. nifeft. 3. §. Itisalfo worth the noting, That wheras, in moft Plants, the Barque and Wood do both grow thicker every year: the Pith, on the contrary, groweth more {lender ; So that in a Branch of one years growth, it is apparently more ample, than in one of two; and ina Branch of two, than in one of three ; and fo on. 4. §. The Pith, for the moft part, if not always, in the Branch, as well as the Root, is furnifhed with acertain number of sap-Ve/fels. Theyare here ufually fo poftur’d, as to make a Ring on the Margin of the Pith, Where they are more numerous,orlarge, they are more evident 5 as in Walnut, Fig, Pine, and others. They arealfo of di- py 9. vers Kinds, anfwerable to thofe in the Barques as in Wallnut, Lyn- r , 3 m pheduds; in Fig, Laeals; in Pine, Refiniferous. BhynB?. 5. §. The Parenchyma of the Pith is compefed of Bladders. Which are the very fame with thofe in the Barque, and oftentimes in the 7Jfertions within the Wood, Only thefe in the Pith, are of the largeft Size 5 thofe in the Barque, of a lefler 5 and thofe of the Infértious leaft of all: for which reafon theyare lef§ obvious than in the P7th, 6. §. The Bladders of the Pith, though always comparatively Great; yetare of verydifferent Sizes. Being eafily diftinguithed, even 7, as to their Horizontal Area, to Twenty Degrees. Thole of Fig, Bar- I, ,. berry, and fome others, are fomewhat large. And of many Herbs, as oO |
