cription 
y omit 
Book II. of Roots. 
Aer-Veffels. This Connexion I have no where fò well fen. 
White Bottoms of the Bladders of a Bulrufh, being cut tr 
in they have the appearance, of very Fine and clofe Ne 
, as in the 
rfe 5 where- 
work, 
10. $. The Fibres by which the faid Threds are knit together, 1 
think are all Single : and are feldom and {carcely vifible, except by 
obliquely Tearing the Pith 3 by which means, they will appear th 
the Glafs, broken off, fometimes, a quarter or half an Inch, o, 
Inch in Length; and as fmall as one Single Thred of a Spiders 1 
In a Bulrufh, they are fometimes difcernable in cutting by the Lengt 
Thefe Fibres, and the Threds , they knit together, for the moft part; 
are fo pellucid, and clofely fituate, that they frequently feem to 
make One entire Body, as a piece of Ice or a film of Water ie 
felf: or even as Animal Shins fometimes thew, which yet are known 
to be Fibrous. 
ii. $. The Situation of thefe Threds, is contrary to that of the 
Veffels, as thole by the Length, fothefe, chiefly, by the Bredth of the 
Root,or horizontally, from one edge of the Pith to the other. They ar 
continued circularly ; whereby, as oft as they keep within the compafs 
of the feveral Bladders, the faid Bladders are Round : But where th y 
winde out of one Bladder, into another, they mutually Interfe& a Chord 
of their feveral Circles ; by which means, the Bladders become Angu- 
lars 
12. $. The Contexture, likewife, both of the Parenchymons Part 
of the Barque, and ofthe Diametral Portions inferted betwixt the Lig. 
zons 5 isthe fame withthis ofthe Pith, now deferibed ; that is, Fibrous, 
Whence we underítand, How the feveral Braces and Threds of the 
fels are made: For the Vefels running by the length of the Root, as the 
Warp 5 by the Parenchymons Fibres running crofs or horizontally, as 
the Woof: they are thus kmit and as it were flitched up together. 
Yet their weflage feemeth not to be fimple, as in Cloath 5 but tha 
many of the Parenchymous Fibres are wraped round about cach 
Veffel 3 and, in the fame manner, are continued from one Veffel to 
another; thereby knitting them altogether, more clofely, into one 
Tubulary Thred 5 and thofe Threds, again, into one Brace: much af 
ter the manner of the Needle work called Back-Stitch or that ufed in 
Quilting of Balls. Some obfcure fight hereof, may be taken ina Thred 
ofCambrick, through a Microféope. But it is moft vifible, inthe Leaves 
and Flowers of fome Plants, The Delineation of thefe Things I hall 
therefore omit, till we come hereafter to {peak of the other París. 
13. $. From what hath been faid, it may be conjectured ; That 
the Aer Vefféls faccefüively appearing in the Barque, are formed, not 
out of any Fliéd Matter, asare the original ones: But of the Parenc 
mous Fibres fo, by changing them from a spherical to a Tabul 
Forme. 
14. $. From the precedents, it is alfo manifeft, That all the P. 
chymous Parts of a Root, are Fibrous. 
15. $. And laftly, That the whole Body ofa Root, confifteth of 
Peffelsand Fibres. And, That thefe Fibres themfelves, are Tubulous, 
or, 
ren- 
77 
