Analyfts of the Air. 297 
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 attra&ed by 
the diflfolving 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 leaft not from the metalr 
lick particles of the gold, for that lofes no- 
thing of its weight in the folution ; fo that 
if any does arife from the gold, it muft 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 diffolved alkaline body, but 
in part alfo from the acid. Thus the great 
quantity of elaftick air, which in Exper. 8 §, 
is generated from the mixture of Vinegar 
and Oyfterfliell, may as well arife in part 
from the Tartar , to which Vinegar owes 
its acidity, as from the dilfolved Oyfterfhelh 
And what makes it further probable is, that 
the Vinegar lofes its acidity in the ferment, 
that is its Tartar : for diffolving menftruums 
are generally obferved to be changed in fer- 
mentation, as well as the dilfolved body. 
Have 
