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PROP. XI. 
Let the body A (fig. 6.) be either faturated or over 
■ or undercharged ; and let the fluid within it be 
in equilibrio. Let now the body B, placed 
near it, be rendered overcharged, the fluid 
within it being fuppofed immoveable, and dif« 
pofed in fuch manner, that no part of it fliall 
be undercharged ; the fluid in A will no longer 
be in equilibrio, but will be repelled from B : 
therefore, the fluid will flow from thofe parts 
of A which are nearefl; to B, to thofe which 
are more diftant from it ; and, confequently, 
the part adjacent to M N (that part of the fur- 
face of A which is turned towards B) will be 
made to contain lefs eledtric fluid than it did 
before, and that adjacent to the oppofite furface 
R S will contain more than before. 
It mufl: be obferved, that when a fufficient quan- 
tity of fluid has flowed from M N towards R S, the 
repulfion which the fluid in the part adjacent to 
M N exerts on the reft of the fluid in A, will be fo 
much weakened, and the repulfion of that in the 
part near RS will be fo much increafed, as to com- 
penfate the repulfion of B, which will prevent any 
more fluid flowing from M N to R S. 
The reafon why I fuppofe the fluid in B to be 
immoveable is, that otherwife a queftion might arife, 
whether the attradion or repulfion of the body A 
might not caufe fuch an alteration in the difpofition 
of the fluid in B, as to caufe fome parts of it to be 
VoL. LXI. 4 I under- 
