[ 262 ] 



of it with one of nitrous air oc- 

 cupied 1.06^; whereas one meafure 

 of common air and one of nitrous 

 air occupied at that time 1.08. 



114. This refult convinced me 

 entirely that the nitrous teft really 

 fails in this kind of air; for though 

 it gave all the appearance of good 

 air, yet it exploded with a loud re- 

 port ; and a chicken placed in it 

 grew immediately fick, and was 

 ready to expire in fix minutes, when 

 I took it out quite motionlefs. 



115. The remainder of the fame 

 inflammable air, which had Hood 

 during fix days with the Perficaria 

 urens in Exp. 112, without being 

 much changed, was let up in a jar 

 containing a plant of muftard. Af- 

 ter ftanding 24 hours in the garden 

 I put it to the teft, when I found it 

 fo much mended, that one meafure 



of 



