C 99 ] 



proach near to the goodnefs of 

 common air. This gave me fome 

 fufpicion, that this inflammable air 

 might be fufceptible of a ftill more 

 remarkable correction or purifica- 

 tion, at leaf! in appearance, with- 

 out loling its exploflve quality. 



On purpofe to difcover the whole^ 

 I left fome inflammable air upon 

 perficaria^ and fome upon wallnut 

 leaves, during forty-eight hours* 

 keeping the jars continually in the 

 open air. 



I tried firfl the air of the jar in 

 which the wallnut leaves were, in 

 the manner familiar to Dr. Prieflley 

 and in that of A. Fontana ; and re- 

 peated each trial twice with the fame 

 refult. I found the air by both 

 thefe methods to exhibit all the ap- 

 pearance of air, fuperior in quality 

 to common air ; as may be feen in 

 H 2 experi- 



