
Book i; of Plants. 

parts, yetat their tops. Where though either deriv’d or amplify’d 
from the Cortical Body, yet being by its [zjértions only, we may there- 
fore fuppofe, as thofe, fo this, to be more finely conftituted. And 
being alfo from its coarctation, while inferted, now free 5 all its Pores, 
upon the fupply of the Sap, will more or lefs be amplified: Upon 
which accounts, the Sap thereinto received, will be more pure, and. 
its fermentation therein more active. And as the Pith is faperiour to 
the Cortical Body by its Constitution, fo by its Place, For as it thus 
ftands central, it hath the Lignovs Body farrounding it. Now as the 
Skin is the Fence of the Cortical Body, and that of the Lignows; fo is 
the Ligwous again afar more preheminent one unto the Prth ; the Sap 
being herea brisk Liquor, tv#n'd up asin a wooden Cask. 
28. §. And asthe pith fubferves the higher Fermentation of the 
Sap 5 fo do the Infertions its purer Diftribution 5 that feparation which 
the parts of the Sap, -by being férmented in the Pith, were difpos'd for s 
being, upon its entrance into the Infertions, now made: So that as the 
Skin is a Filtre to the Cortical Body, fo are the Infértions a more pre- 
heminent one to the Ligwous. And as they fubferve the purer, fo the 
freer and fufficient diftribution of the Sap: For the Root enlarging, 
and fo the Lignons Body growing thicker, although the Cortical and the 
Pith might {upply Sap fufficient to the nutrition of its Parts next adja- 
cent tothems yet thofe more inward, muft needs be fcanted of their 
Aliment 5 and fo, ifnot quite ftarv’d,yet be uncapable of equal growth: 
Whereas the Ligvous Body being through its whole breadth frequent- 
ly difparted,and the Cortical Body inferted throtgh it 3 the sapby thofe 
Infertions, asthe Bloud by the difleminations of the Arteries, is frecly 
and fufficiently convey‘ to its intimate Parts; even thofe,which from 
either the Barque or fromthe Pith, are moft remote. Laftly, as the 
confequent hereof, they are thus afliftant tothe Latitudinal gromth of 
the Root 3as the Lignows Body to its growth in Length ; fo thefe Ixfér- 
tions of the Cortical, to its better growth in Breadth. 
29. §. Having thus feen the folitary ufes of the Several Parts of 
the Roof, I thall laftly propound my Conje@aires of that Defign where- 
to they are altogether concurrent, and that is the Circulation of the 
Sap. 
30. §. That the sap hath a Double, and fo a Circular Motion, in 
the Root; is probable, from the proper Motion of the Roo?, and from 
its Office. From its Motion, which is Defcent: for which, the Sap 
muft likewife, fome where, have fuch a Motion proper toit. From 
its Office, which is,To feed the Truk: for which, the Sap muft alfo, 
in fome Part or other, have a more efpecial Motion of Afcent. 
31. §. We may therefore fuppofe, That the Sap moving inthe 
Barqne , towards the Pith, through the Jnjertiozs, thereinto ob- 
tains a pafs, Which paflage, the upper Infertions will not favour 5 
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- 
caufé there, from the fmalne of the Pith, the oppofition is little, and 
from the fhortnefs of the Ivfertions, the way more open. So that the 
Sap here meeting with the leaft oppofition, here it will beftow it felf 
(feeding the Lignows Body in its paflage) into the Pith. Into which, 
freth sap ftill entring, this being yet but ee will fubfide : that 
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