1 
^$11 Anahjfn of the Air. 
the ftrongcr and more lucid colours— 
and be more and more difficultly diverted. 
Qu. 29. So Qi^i. 30, he obfervcsof air, that 
denfe bodies by fermentation ratify into 
ff feveral forts of air, and this air, by fer- 
mentation, and fometimes without, returns 
into, denfe bodies.” And lince we find 
in faft from thefe Experiments, that air a- 
rifes from a great variety of denfe bodies, 
both by fire and fermentation, it is probable 
that they may have very different degrees of 
elafticity, in proportion to the different fize 
and denfity of its particles, and the different 
force with which they were thrown off in- 
to an elaftick ftate. Thofe particles ( as 
Sir Isaac Newton obferves) receding 
from one another, with the greateft re- 
5 ^ pulfive force, and being moft difficultly 
brought together, which upon contadl 
cohere moft ftrongly.” Whence thofe of 
the weakeft elafticity, will be lead able to 
refill a counter-afling power, and will there- 
fore be fooneft changed from an elaftick 
to a fixt ftate. And 'tis confpnant to reafon 
to think, that the air may confift of infinite 
degrees of thefe, from the moft elaftick and 
Repelling, till wc come to the more fluggiffi, 
watry 
