aherat is, 
Erbe der; 
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Book III. of Trunks. 
Vefel of a wider, asa more agreeable bore. Nature obtaining here- 
by, that the Quantity of 4er, (hall always be anfwerable to the 
Growthof the Plant, or at leaft, be füfficient to maintain its Vegetable 
Lifeand Vigour. 
15. $. And therefore, as is above hinted, it feems likely, That after 
a certain number of years, the Aer-Peffls are no longer amplified,but 
ftand at a ftay, and perhaps may grow finaller, according asthe Tree is 
leß or mote Longeve; and that hos this period, it is fome way or other 
in its Declining State, 
16. $. LASTLY, from the Content and Governing Principle of 
the Aer-vefféls, the Time, when they begin every year to be formed, or 
toappear, is always later ; at leaft with refpect to the Seafon of the 
Tree. So that whereas the Sap-Vefels begin to be formed in Spring : 
thefe, not till the latter end of Simmer, or there abouts at leaft not 
till about that time to appear. That is, when the Sap begins to de- 
ercafe, and to grow more 4ery 5 and fo more fit matter for the Genes 
+ ration of the faid Aer-Veffels, 
CHAP. W. 
Of the Generation of Liquors. 
PON the Struéfure and Formation of the Parts, de: 
pendeth the Generation of Liquors, as was lately in- 
timated. The manner whereof I have formerly 
fhewed, in difcourfing of the Root. Yet fome things 
I fhal! here further explicate, And Firft, what we 
have formerly aflerted, fe. That the concurrence of 
two Jpecifically diftin& Flvids, is as neceflary to 
Nutrition in Plants, asin Animals. Which appears, as from divers 
other confiderations, fo from the very strudure of a Plant: where in 
all the Organical Parts, orthe Parenchyma and the Veffels, are every 
where mixed together per minima, that is, per minimas Partes organi- 
eas, or Fiber with Fiber of feveral Kinds. Every {mall part of a 
Tree, or of the Barque of a Tree, being asI may fay, a fort of Ling: 
Woolfey. So that there is not the leaft part of the Sap, which is not 
impregnate with divers Efféntial Tindfures, as it is continually filtred 
from the Fibres of one ind, to thofe of another 5 ftanding every 
where woxn'd and ffitch'd up together for the fame purpofe. 
2. $. FROM the fpecial Nature and Strudure of the Parts, the 
Liquors of Plants are likewife fpecified. The Veffels being the chief 
Vifcera of a Plant. For all Liquors in a Plant, are certainly made by 
that Plant. And fince the Plant hath no Vifcera ( fo called) I would 
then know, what its feveral Liquors are made by? If in the Parent 
chyma, farely by that Parenchyma, If in the Vefels, by the Fefelsy 
And if of divers Kinds by divers Kinds of Veffls. So that what the 
Vifeera arein Animals, the Veffels themfelves are in Plants. That is 
to fay, as the Viftera of an Animal, are but Veffels conglomerated : fo 
the Veffels ofa Plant, are Vifera drawn ont at length. 
Za 3. $. 
