2 1 o jinalyfis of the Air. 



obtained by the force of fire in Exper. 69, 

 we find that five times more air was generatec 

 by fermentation than by fire, which mew< 

 fermentation to be a more fubtle diflblveni 

 than fire ; yet in fome cafes there is more aii 

 generated by fire than by fermentation. 



Half a cubick inch of oil of Antimony, 



with an equal quantity of compound Aqua* 



forth, generated 36 cubick inches of elaftick 



air, which was all reforbed the following 



day. 



Experiment XCIIL 



Some time in February, a quarter of a 

 cubicle inch of filings of Iron, and a cubick 

 inch of compound Aqua-fort is, without any 

 water, did, in four days, ablbrb 27 cubick 

 inches of air. It having ceafed to abforb, I 

 poured hot water into the veffel x x, to try if 

 I could renew the ferment. The effect of 

 this was, that it generated three or four cu- 

 bick inches of air, which continued in that 

 ftate for fome days, and was then again re- 

 i orbed. 



I repeated the fame Experiment in warm 

 weather in April, when it more briskly ab- 

 forbed 12 cubick inches in an hour. 



Ex- 



