I 
C 615 ] 
repels the matter in the cylinder} and the redundant 
fluid \n'Eab¥ is at liberty to move, if it had any 
tendency to do fo, without moving the cylinder j lb 
that the only thing which has any tendency to impel 
the cylinder in the diredlion E A is the prefliire of the 
redundant fluid in A againfl: AB; and as the 
part near E F is faturated, there is no redundant fluid 
to prefs againfl the plane EF, and thereby to coun - 
teradl the preflhre againfl AB. Suppofe now all the 
eledfric fluid in the cylinder to become fluid j the 
force with which the two bodies attract each other 
will remain exa<flly the fame j and the only alteration 
in the preflure againfl A B, will be, that that part of 
the fluid in A^^B, which we at firfl fuppofed folid 
and unable to prefs againfl the plane, will now be at 
liberty to prefs againfl it ; but as the denflty of the 
fluid when its particles are prefled clofe together 
may be fuppofed many times greater than when it is 
no denfer than fufficient to faturate the matter in the 
cylinder, and confequently the quantity of redun- 
dant fluid in AabB many times greater than that 
which is required to faturate the matter therein, it 
follows that the preflhre againfl: A B will be very 
little more than on the firfl fuppofltion. 
N. B. If any part of the cylinder is undercharged, 
the preflure againfl AB is greater than the force 
with which the bodies attradf. If the eledtric 
repul (ion is inverfely as the fquare or fome 
higher power of the diflance, it feerns very 
unlikely that any part of the cylinder fliould 
be undercharged j but if the repulfion is in- 
verfely as fome lower power than the fquare, it 
6 is 
