220 Anabyfis of the Air. 
with the quantity obtained by the force of 
fire in Exper. 69 . we find that five times 
more air was generated by fermentation 
than by fire, which fhews fermentation to 
be a more fubtle diffolvent than fire $ yet in 
fome cafes there is more air generated by 
fire than by fermentation. 
Half a cubick inch of oil of Antimony, 
with an equal quantity of compound Aqua- 
fortis, generated 3 6 cubick inches of elaf- 
tick air, which was all reforbed the foL 
lowing day. 
Experiment XCIII, 
Some time in February , a quarter of a 
cubick inch of filings of Iron , and a cubick 
inch of compound Aquafortis , without any 
water, did in 4 daysabforb 27 cubick inches 
of air. It having ceafed to abforb, I poured 
hot water into the veflei pc x, to try if I 
could renew the ferment. The effed of this 
was, that it generated 3 or 4 cubick inches 
of air, which continued in that ftate for 
fome days, and was then again reforbed. 
I repeated the fame Experiment in warm 
weather in April , when it more briskly ab- 
sorbed 12 cubick inches in an hour, 
Expe- 
