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Show The Anatomy Book UE encntnctersneienrerrennenns tinalondsme aii: —————— Book IIL. themfelves Organical ; but their very Svdes alfo, feem to be compofed of other Parts, which are Organical, fc. of Lignous or Tomy Fibres. Which Fibres , ftanding clofe or contiguous in a round Figure, they make one Twbulary Body, whichI call the L ymphaduit ofa Plant. And it is probable, That thefe Fibres themfelves, are alfo Tubulary, That is, that a Lymphedudf, ist a {mall Tube, made up or compofed of other, yet much fmaller Tubes, fet round together in a Cylindrich Figure, As if we fhould imagine a company of Straws, which are fo many{mall Pipes, to be joyned andfet round together, fo as to make another greater Pipe, anfwerable to a hollow Cane, The Cane, Ifay; isas the Lymphadud 5 and the Straws are as the Fibres whereof it is compofed. By which alfo appears, the admirable {mallnefs of thefe Fibres. For there are fome Lymphaeduéts, which maybe reckonedfifty times fmallerthan a Horfe-Hair. Allowing therefore but Twenty of the aforefaid Fibres to make a Thred fobig as one Lymphedud ; then one of the faid Fibres, muft be a Thoufand times {maller than a Hor/eHair. That thefe Fibres, whereof the Lympheduds are made, are themfelves made up of other Fibres, is not altogether improbable. 32. §. Thefe Fibres, although parallel; yet are they not coalefcent, but only contiguous; being contained together ina Tubulary Figure, by the Weftage of the Cortical Fibres, as in Chapter the Fourth will better be underftood. 33. §. The firft notice I took of the Compofttion and Texture of thefe Vefels, fo far as the beft Glafes yet known, will admit; was in ' of Trunks. Chanels, not made or boundedby anywalls or fides proper to them- felves, as a Quil thruft into-a Cork, and as the Aer-Veffels are in the Wood: but only by the Bladders of the Parenchymas which are fo poftured and croudedup together, as to leave certain Cilyndrich Spa- ces, which are continuedby the length of the Barque. 36. §. One difference betwixt the Veffels or Chanels now defcrib’d, and the Tubulary Hoows and other Apertures in the Pith, is this 5 Thatthefe never exift originally with the Pith; but are fo many Ruptures {aperveningto it inits Growth. Caufed, partly, by the Stretch or Tenterit fuffers from the Dilatation of the Wood: (a) and partly, the drying, and fo the Shrinking up of its Blzdders, and of the Fibres whereofthey are compofed. Whereas the faid Veféls in the Darque, are manyof them originally formed therewith. And thofe which are 23. poft-nate, not made by any Rapture, but only fuch a Difpofition of the Parenchymous Fibres, and Conftipation of the Bladders, as is there- unto convenient. 37- §. In paring the Barque of a Branch ofPine, Sumach, &c. they appear, neither parallel, nor any where Inofcwlated: but run, with fomelittle obliquities, diftin& one from another, through the length of the Branch: and fo, we may believe, through the length of the Tree. a very white and clear piece of Afh-mood torn, with fome care, by the length of the Tree, and objected toa proper Light. Theyfeem alfo fometimes difcernable in fome otherclear Woods, asin very white Fir, @c. And having formerly demonftrated, that the Ligwous Part of a Plant, is annually made or augmented out of the inner part of the Barque, wherein the Lympheduits always ftand: we may reafonably fuppofe the fame Lympheduéfs to have the like Conformation in the Barque, as in the Wood. 34. §. And Iam the rather induced to believe, that I am not mit taken in this Defcription, upon thefe two Confiderations. Firff, that herein the Analogybetwixt the Veféls of an Avimal anda Plant, is the more clear and proper. For as the Sanguineous Veffels in an Animal are compofed of a numberof Fibres, fet round, ina Tubulary Figure, together : fo are thefe Lymphaduds of a Plant. Secondly, in that herein, there is a more genuine refpondence betwixt thefe, and the other Veffels of a Plant it felf ; fc, the Aer-Vefels ; which are made up of a certain number of Round Fibres, ftanding collaterally, or fide to fide as have already obferved in the Avatomy of Roots. So thatit is the CHAP. I Of the WOO D. HE next general Part of a Branch,is the Wood 5 \\F which lyeth betwixt the Bargue and the Pith, And this likewife evermore confifteth of Two General Parts, fc. of a Parenchymous Part, and that more properly called Ligwous. The Pa2) renchymous Part of the Wood, though muchdiverfifyed, yet in the Traks of all Trees whatfoever,hath this property, To be difpofed into * many Rays, or DiametralInfertions, running be- twixt fo many Lignons Portions, from the Bargue to the Pith: as in whereas in the Aer-Vefféls, the Fibres are poftured or continued Spi- any of the Quarters here before us may appear. 2. g. But thefe Infertioms are muchdiverfifyed, according to the feveral Sorts of Plants. Soin Barberry, Afh, Pine, Worm-wood, they Typ 54 are lefs numerous. In Elm, Wallut, Fig, Sumach, theyare more. to 35. And in Holly, Pear, Plum, Apple, Oak, Hazel, are moft numerous. 3. §. Thefame Infertions, in Barberry, Wormwood, and fome in Oak, are very Thick. In Pine, Fig, Ajh, of amiddle Size. In Pear, {have yet ufed, they feem to be made, chiefly, by the Conftipation berry, Elm, Afb, Sumach, Fig, they are of an Equal size. lefs ftrange, that the Lywsphaedués thould be made up ofFibres, fince the Aer-Veffels are eviden tly fo made. Only with this difference, that rally: here, inthe Lympheducis, they ftand andare continued only in ftraight Lines. 35-§. THE STRUCTUREofthe Laéfiferous and Gum-Veffels,which have avery ample Bore, is more apparent. And, by the beft Glaffes of the Bladders of the Barque. Thatis to fay, That they are fo many Chanels, Holly, and moft of them in Oak, are exceeding Small. Again, in Bar- [jj]. In Holy, Hazel, Pear, Plum, Oak, they are very Unequal: fome of thofe in Folly, being Four or Five times thicker than the refts in Plum, Six or Seven times; and inOzk, Ter timesat leaft. _% ue j 4. § ii iy |