Ancilyfts of the An\ ^97 
of the parts is the ftrongeft : For by compa- 
ring Experiment 49 and 51. we fee that 
much more air was fpund in the diftilla- 
tion of horn than of blood. And the co- 
hefion of animal fubftances was not, as we 
find by the fame Experiment, diffolved even 
in the blood, without confiderable violence 
of fire 5 tho' it is fometimes done to a fa- 
tal degree in our blood, by that more fub- 
tile diffolvent fermentation ; But we may 
obferve, that volatile Salts, Spirits, and fuh 
phureous Oil, which arc at the fame time 
feparated from thefe fubftances, will not, 
niake elaftick air. 
Experiment CXX. 
As elaftick air is thus generated by the 
force of fire, from thefe and many other 
fubftances ,* fo is the clafticity of the air great- 
ly deftroyed by fulphureous bodies. Sir Ifaac 
Newton obferves, that as light ads upon 
“ fulphur, fo fince all aftion is mutual, ful- 
phurs ought to aft moft upon light.*’ And 
the fame may be obferved of air and fulj 
phurj for by Experiment 103? it is found 
that burning fulphur, which is a very ftrongly 
attrafting 
