■2 I 2 
■Analy/is of the Air. 
The effects of the Fermentation of mineral 
Subflances on the Air. 
I HAVE above (hewn that air may be 
produced from mineral Subflances, by 
the adioh of fire indiflillation. And we have 
in the following Experiments many inflan- 
ces of the great plenty of air, which is gene- 
rated by fome fermenting mixtures, abforbed 
by others, and by others alternately gene- 
rated and abforbed. 
Experiment XC. 
I poured upon a middle fized Gold Ring, 
beat into a thin plate, two cubick inches 
of Aqua Regia the Gold was all diflblved 
the next day , when I found 4 cubick in- 
ches of air generated; for air bubbles were 
continually arifing during the folution . But 
fince Gold lofes nothing of its weight in 
being thus diflblved , the 4 cubick inches of 
air, which weighed more than a grain, muft 
arife either out of the pores of the Gold, 
or from the Aqua Regia, which makes it 
probable, that there are air particles in acid 
fpiritsj 1 
I 
