Analyfis oj the Air. 29 j 



There is good reafon alfo to fufpe&,that 

 thefe acid fpirits are not wholly free from 

 air particles, notwithftanding there were no 

 elaftick ones produced, when they were put 

 into a brisk motion, by the a&ion 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 attra&ed by 

 the diflblving 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 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 muft be 

 what may be latent in the pores of the goldo 

 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. 83. 

 Is generated from the mixture of Vinegar 

 and Oyftcrfhell, may as well arife in part 



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