[ 264. -] 
of it with one of nitrous air oc- 
cupied 1.063; 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- 
Pars and a Ss —_ in it 
rea to Saprei in 1 fix rantiees: when 
I took it out quite motionlefs. 
11s. The remainder of the fame 
inflammable air, which had ftood 
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 Les to the. — — I a it 
