C 645 ] 
CoROL. I. 
If the fluid in the canal is difpofed in fuch man- 
ner that the repulfion or attradion of the redundant 
□id or matter in it, on the whole or any given part 
of the fluid in the canal, has no tendency to impel it 
either way in the diredion of the axis ; then the force 
with which that whole or given part is impelled by 
the two bodies muft be nothing; or the force with 
which it IS impelled one way in the-diredion of the 
axis, by the body B, muft be equal to that with 
Which It IS impelled in the contrary diredion by the 
other body ; but not if the fluid in the canal is dif- 
poied in a different manner. 
C o R o L. If. 
If the bodies, and confequently the canal, is over- 
charged ; then, in whatever manner the fluid in the 
canal is difpofed, the force with which the whole 
quantity of redundant fluid in the canal is repelled 
by the body B in the diredion A muft be equal to 
that with which it is repelled by h in the contrary 
diredion. For the force with which the redundant 
fluid IS impelled in the diredion A^ by its own re— 
pulfion, is nothing ; for the repullion of the particles 
of any body on each other have no tendency to make 
the whole body move in any diredion. 
Re- 
