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Paris* Vitriolic acid extracts from 

 calcareous earth, fixed air, and from 

 fome kinds of fparrs an air of a 

 wonderful quality, corroding glafs 

 itfelf, which feems to be almoft an 

 incorruptible fubflance, and reduc- 

 ing it into dud by its contact only ; 

 and this air, fo active upon glafs, is 

 by the firft approach of water im^ 

 mediately reduced again into the 

 form of the llone put of which it 

 was extracted, 



Coniidering all what is faid be- 

 fore, I incline much to the opinion, 

 that the various kinds of air extracted 

 from the different bodies owe, for 

 a great part, their fpecific nature to 

 the tranfmutation which they un- 

 dergo in the operation by which 

 they are obtained ; and that they 

 cannot, at leart not all, be faid to 

 exift in the body in a contracted 



Hate 



