• [658] 
able ta drive lb much fluid out of it, or from the 
nprer to the further part', as when placed at a Icfs 
diflance. 
Case X, and XI. By the fame reafoning it ap- 
pears, that if the two bodies are both negativ’ely 
elcdrified in the fame degree, they mu ft repel each 
other : but if they are both negatively eletftrified in 
different degrees, it is poflible for them to attradf 
each others 
All thefb (;afe^ are exadlly conformable to experi- 
ment. 
Case XII, Let two cork balls be fufpended by 
condudting threads from the fame pofitively eledrified 
body, in fuch manner that if they did not repel, they 
would hang dole together : they will both be equally 
eledrified, and will repel each other : let now an 
overcharged body, more ftrongly elcdrified than 
them, be brought under them ; they will become 
Icfs overcharged, and will feparate lefs than before : 
on bringing the body ftill nearer, they will become 
not at all overcharged, and will not feparate at all : 
and on bringing the body ftill nearer, they will be- 
come undercharged, and will feparate again. 
, Case XIII. Let all the air of a room be over- 
charged, and let two cork balls be fufpended dole to 
each other by conduding threads communicating 
with the wall. By Prop. 15, it is highly probable 
that the balls will be undercharged ; and therefore 
they fhould repel each other. 
Thefe 
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