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Show Book Il. The Anatomy 1146 rood. In the Wood, I fay 5 for in the Barque, i y i vity, than any ste a ten than the biggeft Aer-Ve/fels that be. : easTh Va ities hereof are very many5 in refpect both of their ae ay 1dPojition being, as to thefé, the fame, in no two penespre’ ee Firft Number.dedces So in fi dilfehene eSofbattheir Fir in refpect of Plants whatfoever. Sorts zel Apple, Pear, they are very numerous 5 bu Tome Tab. 23, 25, 26. a eicteeted in the Figures already referred to, by a rf he . to tsinthe Weod. In Holly, Plum, Barberry fomewhat oan n 22, 24, 27+ Oak Ah, Walnut fewer. 2953033 fows fe. i In ate a a Kindred, very ther kind of Plant. a ee fe rex ay # vefoett of their Size 5 which from the firft or : oF oat ealily to about Twentyy Degrees. to the leaft, may be :computed deafily eateft, ° e rany of thofe in Elm, Ah, Walnut, Fig, Oak, are very large. Ei B eyes Plum not fo large. In Hazel, Sumach, {maller, In a ly, pe fa (till {aller Size. So that many of thofe in Elm, or Oak, pia are Twenty times bigger, than thofe in Holy or Pear. — : 20. §. Inan ordinary joynted Cane, they are fo wide, that if you tiketeie a yard, or a yard and + long,and putting one end rise : oe) fin of Water, you blow ftrongly at the other; your ae ‘ i mediately pafs, through the eeeen ofthe Cane, fo as to i i at many Bubbles. oecop haatedhaves different Size in divers Kinds ofPlants 5 fo likewife, according to the place where they ftand, in the . oe So in Holly, Hazel, Apple, their Size is more equal throughout t € so i bredth ofthe Tree. But in Barberry, El, Oak, Alb, very different: Se Hor fortuitoufly, but always much after the fame manner. Forin all 24, 98,09, the laft named Branches, the Aer-Veffels that ftand in the inner yee of eachannual Ring, are all vaftly bigger,than any of thofe that ftan ae i ing. f : “i - oterly. “hele “der-Vefels are alfo different in their Sitvation. $0 in Apple " wallnut, Fig, theyare {preadall abroad in every tak > 30, 31. Tab. 22. a3, 32: annual Ring pofited in one certain ce st In aterothers, a ' i not being bei i anyy one Line, they keep more within the compafs of fome Line or Lines either Diametral, or Peripherial. Soin Holly they are Radiated, or runin Ge Diametral Lines betwixt ca et me Barque. Soalfo are fome o i ; and fome few in Wallut. ey sae: Whetherties ftand Irregularly, or are Radiated, it is tobe noted, That Nature, for the moft part, fo difpofeth of them, ce many ofthem mayftill tand very near the Infertions. So in Apple, fhe will rather decline making an even Live or in Holly, will rather break that Line into Parcels, than that the Aer-Vefels fhall ftand he mote from the Infértions. To what end this is done, fhall be fai ae Again, in Afh, the Aer-Vefels are none of them Radiated, but moft of them ftand in Circles on the inner Margin of every os al Ring. WhichCircle is fometimes very thick, asin A/h and a In others but thin, the Vefels ftanding, for the moft part, a throughout the Circles 5 as in Elm. Sometimes again, they both make a Circle, and are alfo fpread abroad 5 asin Pear and Plum. _ Txb,24. 2 25. §. Thofe likewife which are fpread abroad, are gies i. gularly pofited. So in Barberry, befides thofe larger, that make irc ther {m aller ones, 9 that ftand, 5 Circle, there are other i ique Face Lines. > in obliqu Book Il. of Trike 117 athwart one anothers almoft like a Bend, or fometimes, an entire or broken Saltyr in an Efeutcheon, In Oak, they make rather certain Tab. 33. Columns, in the pofture of the Pale. And in Elm, they make, as it 38 . were, many crofs Parcels, inthe pofture of the Fefi. 26. §. This great difference in the Size and Pofition of the Aer. Veffels, in the fame individual Plant, is one ground, for which, I think it probable, Sap-Veffels. , That there are divers Kinds of Aer-Veffels, as well as of Even as in Animals, there are divers Kinds Of Organs for Spiration, and the feparatién of Aer: Fifbes Land-Animals their Lungs; and thofe in Frogs,having their Branchia Gc. being of a fomewhat peculiar Kind. ’ 27. §. THE Form and Texture of thefe Veffels, and the various ways whereby they may be beft obferved, I and fhewed in my Avatomy of Roots. As to have already defcribed their Form, one thing P. 1.¢. 4. remarqued was this; That they are never Ramiffed, but diftin@ly continued from one end of a Plant, f{itiall or as the Nerves are in Animals. A further and great, to the other: eafie proof whereof, may be made, only by holding up a piece of an Ordinary Cane, about £ a foot long, cut very {mooth at both light whereupon, if you keep: it in a ftraigh ends, againft a full Light, and the caft of your Eye, and then. lookt Lixe betwixt the fteadily, you may fee quite through it, thatis, through the Aer-Veffels, which run ftraight along the Caze from endto end. 28. g. As to their Texture; whereas; oftentimes, the Aer-Veffels appear to be azroaved in the form of a very {mall Pléte, it is to be noted, That it is not only of different bredth, in divers Plants, and ufually much broader in the Root, than in the Trunk: but alfo, that in the Truzk, many times, the faid Veffels are unroav ed or refolved; which Diverfity, ate principally Three; viz. The The Caufes of Weftage of the Fibres of which the Aer-Vefféls confifts The defere faid Fibres, or betwixt the Warp and the Woof; nce betwixt the And the different Kinds of Woof. 29. §. By the Weftage of the Fibres; it is; That tentimes, wzroave in the forth of a Plate. As if we the Veffels, of fhould imagine a piece of fine narrow Ribband, tobe woun'd fpirally, and Edg to Edg, round about a Stick; and fo, the Stick being drawn band to beleft in the Fiewre of a Tube, anfwerable out, the R7bto an AerVeffel, For that which, upon the unroaving ofthe Veffel, feems to be a Plate, Tab. 39: or one not inthe form of a Plate, but of a RoundThred. fingle Piece, is, as it were, a Natural Ribbai d; confifting of feveral Pieces, that is, a certain number of Threds or Round: Fibres, ftanding parallel, asthe Threds do in an Artificial Ribban d. ‘And as ina Ribband, fo here, the Fibres which make the Warp, and which are Spirally continu’d 5 although they run parallel, yet are not coallefcent; but conteined together, by other Tranfverfe Fibres in the place of a Woof. 5 And as thé faid Fibres are tranfverfly continued; thereby making a Warp and Woof: So are they (as in divers woven fadures ) of very different Bulk; thofe of the Former, being Maun« bigger, and therefore much ftronger, than thofe of the Latter. much By Which means, as Cloth or silk will often Tear one way, and not ther; fo here, while the Warp ot thofe Fibres whichare Spirall anoy continued; |