io On the transposition of AIRS. 



the inflammable air which had been kept in a glafs veflel 

 of this kind all the winter was of the ftandard of 1.45, 

 and had nothing fenfibly inflammable in it. I had many 

 refults of the fame kind ; but in a glafs veffel which was 

 only cracked, but was air-tight, the inflammable air was 

 not changed ; though when a folution of copper in the 

 nitrous acid was put into it, there was an efflorefcence 

 from every part of the crack on the outfide, which fhewed 

 that it was not in all refpeds impervious. 



No. 



