dnalyfis of the Air. 1 97 



by the great quantity of acid fpirit, in which 

 they were involved. For we fee in Experi- 

 ment 90. that when the acid fpirit of Aqua 

 Regia was more ftrongly attracted by the 

 diflblving gold, than by the air-particles, 

 then plenty of air-particles, which were thus 

 freed from the acid fpirit, did continually 

 arife from the Aqua Regia, and not from the 

 gold, at lead not from the metallick particles 

 of the gold, for that lofes nothing 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 alka- 

 line fubftances, may not arife wholly from 

 the diflblved alkaline body, but in part alio 

 from the acid. Thus the great quantity of 

 elailick air, which in Experiment 83. is gene- 

 rated from the mixture of Vinegar and Oyfter- 

 fhell, may as well arife in part from the Tar- 

 tar, to which Vinegar owes its acidity, as 

 from the diflblved Oyfterfhell. And what 

 makes it further probable is, that the Vine- 

 gar lofes its aciditv in the ferment, than is, 

 its Tartar: for diflblving menftruums are 

 generally obferved to be changed in fermen- 

 tation, as well as the diflblved body. 



Have 



