[ 628 ] 
Other, or at fo great an one, that the repurfion 
of either body on the fluid in the canal fhall 
not be fenfibly lefs than if they were at an in- 
finite diftance : then, if the eledric attradion 
and repulfion is inveriely as the n power of the 
diftance, n being greater than one, and lefs 
than three, the quantity of redundant fluid in 
the two bodies will be to each other, as the 
n — I power of their corrcfponding diameters 
A F and af. 
' For if the quantity of redundant fluid- in the two 
bodies is in this proportion, the repulfion of one 
body on the fluid in the canal, will be equal to that 
of the other body on it in the contrary diredionj 
and, confequently, the fluid will have no tendency 
to flow from one body to the other, as may thus be 
proved. Take the points D and E very near to each 
other j and take daxo DA, and r ^ to E A, as af to 
AF ; the repulfion of tfre body B on a particle at D, 
will be to the repulfion of b on a particle at dy as 
-i_ to — ; for, as the fluid is difpofed fimilarly in 
AF af 
both bodies, the quantity of fluid in any fmall part 
of B, is to the quantity in the correfponding part of 
by as A F”"' to a ; and, confequently, the re- 
pulfion of that fmall part of B, on D, is to the 
repulfion of the correfponding part of by on dy as 
or to — . But the quantity of fluid in 
’ AF’ ^ 
the fmall part DE of the canal, is to that in dcy as 
DE to dCy or as AF to therefore the repulfion 
of 
