C ^52 ] 
will all be pofitively eledrified ; for if there is no= 
other over or undercharged body placed near any 
of thele bodies, the thing is evident j and though 
Ibnie of thefe bodies may, by the approach of a 
fufficiently overcharged bodv, be ‘rendered under- 
charged; yet I do not fee how it is poliible to pre- 
vent a body placed at an infinite diftance, and com- 
municating With them by a canal of ineomprefliblc 
fluid, from being overcharged.. 
In like manner if one of thefe bodies is ele£lri- 
fied by excited fealing wax-, they will all be nega- 
tively eledrified. ^ 
It is impoffible for any body communicating 
with the ground to be either pofitively or nega- 
tively eledtrified : for the earth,, taking the whole 
together, contains juft fluid enough to faturate it, 
and confifts in general of condu6ling fubftances ; 
and confequently though it is poffible for fmall 
parts of the furface of the earth to be rendered 
over or undercharged, by the approach of electri- 
fied clouds or other caufes; yet the bulk of the 
earth, and efpecially the interior parts, muft be 
laturated with electricity. Therefore aflTume any 
part of the earth which is itfelf faturated, and is. 
at a great diftance from any over or undercharged 
part; any body communicating with the ground,, 
contains as much electricity as if it communicated 
with this part by a canal of incompreftible fluid, 
and therefore is not at all eleftrified. 
^ body A, infulatcd and faturated’ with 
eletiricity, is placed at a great diftance from any 
'Over or undercharged body,^. it is plain that it can- 
not be electrified ;, but if an overcharged body is- 
brought 
2 
