Book 1. of Plants. 
parts, yet at their tops. Where though either derivd or amplify'd 
from the Cortical Body, yet being by its Injertions only, we may there- 
fore fuppofe, as thofe, fo thi more finely conftituted. And 
being alfo from its coarctation, while inferted, now fice 5 all its Pores, 
upon the fupply ofthe Sap, will more or lefs be amplified: Upon 
which accounts, the Sap thereinto re , will be more pure, and 
its fermentation thercin more active. And as the Pith is fuperiour to 
the Cortical Body by its Constitution, fo by its Place, For as it thus 
ftands central, it hath the Ligzows Body furrounding it. Now as the 
Skin is the Fence of the Cortical Body, and that of the Lignows 5 fo is 
the Ligrous again a far more preheminent one unto the Pith 5 the Sap 
being herea brisk Liquor, tana'd up asin a wooden Cash, 
28. $. And asthe Pith fublerves the higher Fermentation of the 
Sap 3 lo do the Infertions its purer Diftribution 3 that feparation which 
the parts of the Sup, by being fermented in the Pith, were difposd for 3 
being, upon its entrance into the Infértions, now made: So that as the 
skin is a Filtre to the Cortical Body, fo are the Infertiors a more pre- 
heminent one to the Lignous. Andas they fubferve the purer, fo the 
freer and fafficient diftribution of the Sap: For the Root enlarging, 
and fo the Ligwous Body growing thicker, although the Cortical and th 
Pith might fupply Sap fulficient to the nutrition of its Parts next adja- 
cent to them; yet thofe more inward, muft needs be {canted of their 
Aliment 3 and fo, ifnot quite ftarv’d,yet be uncapable of equal growth: 
Whereas the Lignous Body being through its whole breadth frequent- 
ly difparted,and the Cortical Body inferted through it 5 the sapby thofe 
Infertions, as the Blond by the difleminations of the Arteries, is frecly 
and fufficiently conveyd to its intimate Parts, even thofe,which fronr 
either the Barque or fromthe Pith, are molt remote. Laftly, as the 
confequent hereof, they are thus afliftant to the Latitudinal growth of 
the Root sas the Lignows Body to its growth in Length; fo thefe Infer- 
tions of the Cortical, to its better growth in Breadth. 
29. $. Having thus feen the folitary ufes of the Several Parts of 
the Root, I fhall laftly propound my Conjeétures of that Defign where- 
to they are altogether concurrent, and that is the Circulation of the 
Sap. 
30. $. That the sup hath a Double, and fo a Circular Motion, in 
the Root; is probable, from the proper Motion of the Root, and from 
its Office. From its Motion, which is Deftent: for which, the Sap 
muft likewife, fome where, have fuch a Motion proper toit. From 
its Office, which is, To feed the Trunk: for which, the Sap muft alfo, 
in fome Part or other, have a more efpecial Motion of Afcent. 
31. $. Wemay therefore füppofe, That the Sup moving inthe 
Barque , towards the Pith, through the Infertions, thereinto ob- 
tains a país, Which paflage, the upper Jvfertions will. not favour; 
becaufe the Pith ftanding inthe fame heigth with them, is there large, 
the fermenting and courfe of the Sap quick, and fo its oppofition 
ftrong. But through the lower it will much more eafily enter 5 be- 
caufe there, from the finalneß of the Pith, the oppofition is little, and 
from the fhortneß of the Infertions, the way more open. So that the 
Sap here meeting with the leaft oppofition, here it will beftow it (If 
(feeding the Lignoxs Body in its paflage)) into the Pith. Into which, 
freíh sap ftill entring, this being yet but crude, will fübfide : that 
I firft 
