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expelling the Air out of their Cavity, and forcing it 
into the inferiour Guts (as in windy Cholics) would 
have diftended them to the Pitch mentioned in that 
Effay. At the fame time it is acknowledged, that 
had the Gall been carried clean out of the Body by 
any Vent, fo as that no Stimulus had remained to 
aft either upon the Infide or the Outfide of the In- 
tejlines , then my Way of accounting for the Symp- 
toms had been good, and the Conclufions juft. 
I acknowledge that there is fome Appearance of 
Reafon for this Remark, and the Objeftion which it 
implies ; but the whole Strength of the Argument 
lies in a Suppofition that a Stimulus on the Outfide 
of the Intejtines , is capable of exciting a Contrafti-. 
on, fupplying the Want of that Stimulus on the In- 
fide, and alfo of caufing a preternatural Diftenfion 
of the whole Canal. The Contrary of all which I 
(hall endeavour to prove. 
In order to this it is neceifary to premile, what 
perhaps may not have been universally adverted 
to, yet can be no fooner propofed than acknow- 
ledged. 
i. That the whole Action of the Nerves , whe- 
ther in Senfation or in Mufcular Motion, is exerted 
at their Extremities only. 
x. That the Sides of the Nerves every where 
along their whole Tracis, are entirely infenfible, and 
ferve neither for Senfation nor Motion. 
The apparatus of Nature towards both thefe 
Addons makes this plain. Towards Senfation we fee, 
that the medullary Subftance of the Nerves at their 
Extremities is diverted of its Coverings, which are 
Proceffes of the Dura and Pia Mater y and ends 
bare 
