28 o appendix. 
the fame Properties ? For as all the Parts of 
this Syftem are in a conftant ofcillatory Mo- 
tion, (o all Matter feems to be agitated by a 
rcpulfive and attractive Force. 
II. Bur it is obfervable, that permanent Air 
arifes chiefly and in greareft Plenty, from Bo- 
dies which arc fpccitically heavier than Wa- 
ter, whofe Attraction in a fixed State, and 
Repulfion in an elaftic State, being on that 
Account greater than that of the lighter wa- 
try Particles, they are therefore better adapted 
to be (with the fulphureous Particles, which 
they mofl: ftrongly attraCt) the principal Band 
of Union of foiid Bodies, than the lighter 
watry Particles : Tho’ doubtlcfs all the Parti- 
cles of Matter whatever do in aClual ContaCt 
^ohere, yet fince it is found by Experiments 
XLIX and LV. FbL I. that the mod foiid 
Parts of Animals and Vegetables, yield a vafl- 
ly greater Qiiantity of Air and lefs Water, than 
the more lax and fluid Parts, which abound 
with a watry Fluid; it feems therefore hence 
rcalonable to conclude, that their Solidity is 
principally owing, not to the watry, but to 
the Air and fulphureous Particles. 
15. And the fame holds true, when we 
confider thefe Partklcs in an elaftic State, for 
the 
