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Show The Anatomy Book IIL 9 Se Book IIL Se 4. §. In fome Plants, they are Equidiftant 5 in others, not: in fome, the Great ones are Equidiftant 3 in others, the Leffler 3 in others, both ; in fome, neither. Which Varieties are not accidental 5 but con- and dryed intoa Skiz: even as the very skin of an Adder, upon the gradual generation ofa new one underneath,in time,becomes a Slough, The inmoft portion of the Bargue,is annually diftributed and added to the Wood : the Parenchymous Part thereof making a new addition to the Infertions within the Wood and the Lymphedués a new addition to the Lignous pieces betwixt which the Infertions ftand. So that Ring of Lympheduds in the Barque this year, will be a Ring of Wooda under or over, froma Level, are thereby, upona Tranfverfe Section, ly, from year to year. So the Tzble, for an Apple-Branch, theweth equarter of a Slice of a Branch cut tranfverfly, of Three years growth:a Tab. 25. That of Barbery, of Two That -of Sumach, of One only ; That of 2434, 28. {tant to the Species in which theyare feverally found. f . 5. §. Theyare not always vifibly continued from the Circumference to the Centre of the Wood: but infome Branches, as of Sumach 5 and in moft Truks of many years growth, declining, in fomeplaces, in part cut away. é . §. Theyhave yet one more Diverfity, which is, That in divers of the aforefaid Branches, they run not only through the Wood 5 but alfo fhoot out beyond it, into fome Part of the Bargue, as in El, Sumach, Wormwood, &c. Whereas in Pine, and fome of the reft they either keep not diftin& from the other parts of the Parenchyma of the Barque; or are fo fmall, as not to be diftinguifhed there form. Ww ; : 7. §._ The Texture likewife of thefe Infertions is fomewhat various. For in Wormwood, and moft Herbs, they are manifeftly compofed of {mall Bladders : differing in nothing from thofe of the Bargue or Pith, faving, in their being much lefs. Yet in Herbs, they are much larger than they are in Trees. And in manyTrees, as Apple, Pear, Plum, Pine, &c. they are either quite loft, or fo fqueezed and prefled together by the hard Wood ftanding on both fides, as to be almoft undifcernable. 8. §. So that although the Parenchyma of the Barque or Pith, and the Infertions in the Wood,are ofthe fame Specifick Nature or Subftance: yet there is this difference betwixt them 5 That the Fibres of theformer, are fo Netted together, as to leave feveral round Vacuities 5 or to makea great manylittle Bladders, whereas, in the latter, they are ufually fo far crowded up, as torun (as when a Netis ftretched out ) like a Skez# of Parallel Threds, 9. §. Ofthele Infertions in the Wood, it is futher obfervable,That they do not only run betwixt the Lignows Portions; but that manyof their Fibres are likewife all along diftributed to the feveral Fibres, of which the Lignous Portions confift,and are interwoven with them; both togetherthus making a piece of Linfj-Woolfj Work, ox like manyother Manufadures in which the Warp and the Woofare of different Sorts of Stuf: as in the end of the Fourth Chapteris further explained. to. §. THE WOODis likewife compounded of Two Sorts of Bodies ; That which is {tritly Woody 5 and the Aer-Veféls mixed herewith. The true Wood is nothing elfe but a mafs of antiquated Lymphedutts, viz. thofe which were originally placed on the inner Margin of the Barque. For in that place, there grows, every year, anew Ring of Lymphadudts, Whichlofing its original foftnefs by degrees, at the latter end ofthe year, isturned into a dry and hard Ring of perfe& Wood. It. §. So that every year, the Barque of a Tree is divided into Two Parts, and diftributed two contrary ways. The outer Part falleth off towards the Shin; and at length becomes the Shivit felf. manner, ashath been obferved of the Skin cf the Root. In like Or asthe Cu- ticula in Animals, is but the efflorefcence of the Cutis. I fay, that the elder Skin of a Tree, is not originally made a shiz; but was fome of the midle part of the Barque it {elf} which is annually once, caft otf, and the next 3 and fo another Ring of Lympheduéls,and of Wood, fuccefliv Elm, of Five. 12. §. Hereby two things maybethe better noted. Firft, the ference betwixt the degrees ofthe annual growths offeveral Trees : dif. three years growth in an Ozk, being B as thick as five inan E/y. Secondly, g Ys 244. 33; the difference betwixt the Azzual growths of the fame Tree 5 not ofa conftant proportion,but varying in thicknef, as it fhould being 28 feem, according to the feafon of the year: whereby it may appear, what Jfeafow, or kind ofyear, doth moft ofall favour, the latitudin al growth, orthe thickening ofany Tree. i 13. §. The Lymphedués thus antiquated or tugned into Wood, do rarely,if ever, Bleed: but only tranfmit a kind of Dewyor Vaporows Sap. And fome of them, as in the Heart of fome Trees,it is probable , That they tranfmit not any Swp, either in the form ofa Liquor, or a Vapour: and fo being gradually deprived oftheir Watery Parts,become the Heart. 14. §. Thereis this further variety in the Wood ; reprefented in Walnut, Fig and Ozk, ‘That fome certain parcels hereof, make either feveral {mall and white Rings, as in Oak; orelfe diverswhite and crooked Parcels, tranfverfe to the Infertions, as in Wallant and Fig. For it Tab. feemeth,that,at leaft,in many Trees,fome portion of all the Keds of Ve/- Jelsin the Barque, are not only annually diftributed to the Wood, but > a} do likewife therein retain the fame, or fomewhat like Pofition, which theyoriginally had inthe Bargue. So that asall thofe bigger and darker Portions of the Wood, wereoriginally, the Radiated Lymphaduds of the Barque: fo the little white Circles, or Parcels of Czrcles, in the fame Wood, were originally another fort of Sap-Veffels in the Barque, fe. thofe which havea circular Pofition therein. 15. §. Inthe Branches of Fir, Pine, and others ofthe fame Kindred, there are fome few Turpentine-Veffels {cattered up and down the Wood; and reprefented bythe larger Black Spots. WhichVeffels are eadem nu- Tab. mero, the felf fame, which did once appertain to the Barque; and do even here alfo in the Wood, contain and yield a liquid Turpentine. Only, being pinched up by the Wood, they are become much fmaller Pipes. we §. THE Aer-Vveffils, with the Infértions, and true Wood, alto- gether make up That, whichis commonly called, The Wood of a Tree. The Aer-Vefels I fo call, not in that they never contain any Liquor 5 but, becaufe all the principal time of the growth of a Plant, when the Pefféls of the Barque are filled with Liquor, thefe arefilled only witha Vegetable Aer. 17. §. Inalmoft all Plats, not one in fome hundreds excepted, this is proper tothe Aer-Vefls ; To have are more ample Bore or Ca2 vit9s |