APPENDIX. 281 
the fpecifically heavier Air Particles continue 
in a much more permanently elaflic State, 
than the lighter warry Particles ; which tho* 
probably, by reafon of the much greater Num- 
ber of them in equal Bulks, do make a vafl; Ex- 
plofion when heated to a certain Degree, yet 
on the Abatement of that Heat, they inftant- 
ly lofe their ELilliacy. 
14. It will puzzle the Epicureans to give 
a rational Account how from a Chaos, a meer 
Neceflicy of Nature, and the cafual Concourfe 
of Atoms, lo confiderable a Qiiantity of MatJ 
ter, as we find plentifully interfperfed in ani- 
mal, vegetable and mineral Bodies, fliould be 
endued with this double Capacity, of chang- 
ing pro re nata from a ftrongly attrading fixed 
State, to a permanently and vaftly elaftic State, 
and vice verfa ; this wonderful Property of it, 
which is fo neceflary for carrying on the con- 
ftanc regular Procefles of Nature, mufl: needs 
be owing to the Diredion of an allwife Being. 
Observation X. 
I. TT 7 HEN I would diftill Tartar, or any 
W the like Subftances which abound 
with great Quantities of Air, I have found it 
an 
