[ 6io ] 
undercharged j which might make it doubtful, whe- 
ther B did on the whole repel the fluid in A. It is 
evident, however, that this propofltion would hold 
good, though fome parts of B were undercharged, 
provided it did on the whole repel the fluid in A. 
Corollary. 
If B had been made undercharged, inftead of over- 
charged, it is plain that fome fluid would have 
flowed from the further part R S to the nearer part 
, MN, inftead of from MN to RS. 
PROP. XII. 
Let us now fuppofe that the body A commu- 
nicates by the canal EF, with another body 
D, placed on the contrary fide of it from B, as 
in fig. 5 ; and let thefe two bodies be either fa- 
turated, or over or undercharged ; and let the 
fluid within them be in equilibrio. Let now 
the body B be overcharged : it is plain that 
fome fluid will be driven from the nearer part 
M N to the further part R S, as in the former 
propofltion ; and alfo fome fluid will be driven 
from R S, through the canal, to the body D j 
fo that the quantity of fluid in D will be in- 
creafed thereby, and the quantity in A, taking 
the whole body together, will be diminilhed ; 
the quantity in the part near M N will alfo be 
diminilhed ; but whether the quantity in the 
part near R S will be diminiflied or not, does 
not appear for certain j but I Ihould imagine it 
would be not much altered. 
C o R 0 L- 
