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them in every Direction alike; they would grow 
longer as well as wider. Hence it follows', that if 
the abovemention’d Experiment was to be made 
with Bladders juft as they are taken out of animal 
Bodies, it would not anfwer the Purpofe, as is 
evident from blowing up thofe of Calves, Hogs, 
&c. 
LV1II. 
The mufcular Fibres, it is true, are always in a 
State of Tenfton, but then this Tenfion is very far 
from being to their utmoft Stretch; fo that, were 
they to be inflated in the manner above-mention’d, 
every Mufcle would necefiarily increafe in Length as 
well as Breadth, 
LIX. 
Another infuperable Difficulty belonging to the 
veficular Hypothefis, is how to blow up a Bladder 
open at both Ends; which every Veficle is fuppofed 
to be, by having a free Communication with the 
Bloodveflels. 
LX. 
Having therefore fo much Reafon to conclude? 
that the mufcular Fibres, in their ultimate Divifions, 
are not cellular, but tubular, let us proceed to fhew 
the Manner and Caufe of their Contraction. 
LX, 
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