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The three mineral acids therrir 

 felves may poffibly be but one, 

 and the fame acid modified by fome 

 particular addition, which time may 

 difcover, to feparate and thus to 

 change marine acid into nitrous acid, 

 gcc. Some eminent chymifts have 

 already arTerted this as their opi- 

 nion. More or lefs phlogifton in 

 one acid than in another may make 

 the one quite different in nature 

 from the other. Common air im- 

 pregnated with phlogifton makes a 

 poiibnous air ; and common air, 

 deprived of it, makes dephlogifti- 

 cated air ; in the one an animal 

 dies in a little time ; in the other 

 it lives four or five times longer 

 than in common air. Vitriolic acid 

 extracts from iron its phlogifton, 

 and allows it to impregnate the air 

 difeneao-ed in the act of folution. 



Nitrous 



