2 1 1 Analyfis of the Air. 



The effects of the Fermentation of mineral 

 Siibftances on the Air. 



HAVE above fhewn that air may be 

 produced from mineral Subftances, by 

 the action of fire indiftillation. And we have 

 in the following Experiments many inftan- 

 ces of the great plenty of air, which is gene- 

 rated by fome fermenting mixtures, abforbed 

 by ethers, 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 s the Gold was all diilblved 

 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 diiTolved , the 4 t cubick inches of 

 air, which weighed more than a grain, muft 

 arlfe either out of the pores of the Gold* 

 or from the Aqua Regia y which makes it 

 probable, that there are air particles in acid 



fpirits s 



