Jnalyfis of the Air. 1 1 7 



others, and by others alternately generated 

 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 diffolved the 

 next day, when I found four cubick inches 

 of air generated ; for air-bubbles were conti- 

 nually arifing during the folution : But fmce 

 Gold lofes nothing of its weight in being thus 

 diffolved, the four 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 fpirits ; for by 

 Experiment feventy - five, they abforb air ; 

 which air particles regained their elafticity, 

 when the acid fpirits which adhered to them 

 were more ftrongly attracted by the Gold y 

 than by the air particles. 



Experiment XCI. 



A quarter of a cubick inch of Antimons, 

 and two cubick inches of Aqua Regia, gene- 

 rated thirty-eight cubick inches of air, the 



firft 



