( 14 ) 
« * 
Lemma. 
The T articles of all Fluids have a ref client Force, 
F luids are elaftick or unelaftick : The ela- 
ftick Fluids have their Denfity proportionable to 
their Compreflion, and Sir Ifaac Newton has de- 
monftrated Lib. ii. Se6l. v.) that they confift 
of Parts that repel each other from their refpcd^tivc 
Centers. Unelailick Fluids, like Mercury, Water 
and other Liquors, are by Experiments found to be 
incomprellible ; for Water in the Florentine Exfe^ 
riment could not by any Force be comprefled into 
left Room, but ooz’d like Dew through the Pores 
of the hollow golden Ball in which it was con- 
fined, when a Force was apply *d to prcfs the Ball 
out of its Ipherical, into a left capacious Figure. 
Now this Property of Water and other Liquors 
mud be intirely owing to the centrifugal Force of 
its Parts, and not its want of Vacuity ; fince Salts 
may be imbib’d by Water Without encreafing its 
Bulk, as appears by the Encreafe of its fpecifick 
Gravity. So Metals, which (fingly) have a certain 
fpecifick Gravity beyond which they cannot be 
condens’d, will yet receive each other in their In- 
terftices fo as to make a Compound fpecifically 
heavier than the heavieft of them ; as is experienced 
in the Mixture of Copper and Tin. 
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