Anabjfis of the Air. 299 
tal degree in our blood, by that more fub- 
tile diflolvent fermentation : But we may 
obferve, that volatile Salts, Spirits, and ful- 
phureous Oil, which are at the fame time 
feparated from thefe fubftances, will not 
make elaftick air. 
Experiment CXX. 
As elaftick air is thus generated by the 
force of fire, from thefe and many other 
fubftances 5 fo is the elafticity of the air great- 
ly deft toyed by fulphurcous bodies. Sir Ifaac 
Newton obferves, * c that as light ads upon 
“ fulphur, fo fince all adion is mutual, ful- 
“ phurs ought to ad moft upon light. ” And 
the fame may be obferved of air and ful- 
phur; for by Experiment 103, it is found 
that burning fulphur, which is a very ftrongly 
attrading fubftance, powerfully attrads and 
fixes the elaftick particles of air ; fo that there 
muft needs be a good quantity of un-elaftick 
air particles in oil and flower of fulphur- 
The firft of which is made by burning ful- 
phur under a bell, the other by fublimation : 
In further confirmation of this it is obferved, 
that Oleum Sulphuris per Campanam is with 
more difficulty made in a dry than a moift 
air f and I have found by Experiment 
J y 
