[ 6St ] 
over or undercharged body ; and let B contain the 
fame quantity of eledlric fluid, as if it communi- 
cated with A by a canal of incompreflible fluid : 
then, if B is overcharged, I call A pofitively eledtri- 
fied; and if it is undercharged, I call A negatively 
eledlrifled ; and the greater the degree in which B 
is over or undercharged, the greater is the degree 
in which A is pofitively or negatively ele6trified» 
It appears from the corollary to the 24th pro- 
pofition, that if feverai bodies are infulated, and 
connedled together by conducing fubftances, and 
one of thefe bodies is pofitively or negatively elec- 
trified, all the other bodies mufi; be eleftrified in 
the fame degree : for fuppofing a given body B 
to be placed at an infinite diftance from any over 
or undercharged body, and to contain the fame 
quantity of fluid as if it communicated with one 
of thofe bodies by a canal of incompreflible fluid, 
all the reft of thofe bodies mufl; by that corollary 
contain the fame quantity of fluid as if they com- 
municated with B by canals of incompreflible 
fluid : but yet it is pofiible that fome of thofe bo- 
dies may be overcharged, and others under- 
charged: for fuppofe the bodies to be pofitively 
eleftrified, and let an overcharged body D be 
brought near one of them, that body will become 
undercharged, provided D is fufficiently over- 
charged ; and yet by the definition it will flill be 
pofitively eledlrified in the fame degree as before. 
hloreover, if feverai bodies are infulated and 
connedled together by conducing fubftances, and 
one of thefe bodies is eledrified by excited glafs, 
there can be no doubt, I think, but what they 
4 O 2 ^vill 
