Analyfis oj the Air. 29 j 
There is good reafon alfo to fufped, that 
thefe acid fpirits are not wholly free from 
air particles, notv/ithftanding there were no 
elaftick ones produced, when they were put 
into a brisk motion, by the acUon of fire in 
Experiment 75. which might beoccafioned 
by the great quantity of acid fpirit, in which 
they were involved. For we fee in Expe- 
riment 90, that when the acid fpirit of 
Aqua Regia was more ftrongly attrafted by 
the diifolving gold, than by the air particles^ 
then plenty of air particles, which were 
thus freed from the acid fpirit, did continu- 
ally arife from the Aqua Regia^ and not 
from the gold, at lead not from the metal- 
lick particles of the gold, for that lofes no- 
thing of its weight in the folution j fo that 
if any does arife from the gold, it mull be 
what may be latent in the pores of the gold. 
Whence it is probable, that the air which 
is obtained by the fermenting mixture of 
acid and alkaline fubftances may not arife 
wholly from the diffolvcd alkaline body, but 
in part alfo from the acid. Thus the great 
quantity of elaftick air, which in Exper. 85. 
is generated from the mixture of Vinegar 
and Oyfterfttell, may as well arife ia part 
U 4 from 
