[ s89 ]' 
PROPOSI.TION I. 
\ 
A body overcharged with elefl.rlc fluid attra£ls or 
repels a particle of matter or fluid, and is at- 
traded or repelled by it, with exadly the fame- 
force as it would, if the matter in it, together 
with fo much of the fluid as is fufficient to fatu- 
rate it, was taken away, or as if the body con- 
fifled only of the redundant fluid in it. In like 
manner an undercharged body attrads or repe]&> 
with the fame force, as if it confifted only of 
the redundant matter ; the ekdric fluid, together 
with fo much of the matter as is fufficient to 
faturate it, being taken away.. 
This is evident from the definition offaturation.. 
P R O P. II; 
Two over or undercharged bodies attrad or repd! 
each other with jufl; the fame force that they 
\yoLild, if each body • confifted' only of the re- 
dundant fluid, in it, if overcharged, or of the. 
redundant matter in it, if undercharged. 
For, let the two bodies be. called A and B ; by 
the laft propofltion the redundant fubftance in B 
impels each particle of fluid and matter in A', and' 
confequently impels the whole body A, with the. 
fame force that the whole body B impels it: for the' 
lame reafon the redundant fubftance in A' impels the- 
redundant liibftaixce in B, with the (ame. force that 
thee 
