II 6 Analyfts of the Air. 
fortis, generated 36 cubick inches of elaf- 
tick air, whicli was all reforbed the follow- 
ing day. 
Experiment XCIII. 
Some time in February ^ a quarter of a 
cubick inch o^ filings of Iroriy 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 x x, to try if I 
could renew the ferment. The efFeftof this 
was, that it generated 3 or 4 cubick inches 
of air, which continued in that ftate for 
lomc days, and was then again reforbed. 
I repeated the fame Experiment in warm 
weather in April, when it more briskly ab- 
lorbed 12 cubick inches in an hour. 
Experiment XCIV. 
March 12th, of a cubick inch of filings 
of IroUy with a cubick inch- of compound 
Aquafiortisy and an equal quantity of water, 
for the fiift half hour abforbed 5 or 6 cubick 
inches of air 5 but in an hour more it had 
emitted 
