348 • Abbe Fontana’s Experiments and 
It mu ft be obferved, that during this experiment I 
kept my nofe clofe flopped. 
This fame inflammable air contained in the bladder, 
which I had breathed three times, was examined in va- 
rious manners, and was found to be as inflammable as 
before ; it exploded as ufual, when mixed with dephlo- 
gifticated air, but after having been fhaken in water for a 
fliort time, being tried with the nitrous air, it gave 
III- 10, IV- 10, whereas before it was not at all dimi- 
nifhed. At this time the common air, with the fame ni- 
trous air, gave II- 14, II + 1 o. Hence it appears, that the 
inflammable air, after being breathed, is rather better 
than before, becaufe in that cafe it is a little diminiflied 
by the addition of nitrous air. 
In order to afcertain whether this alteration was occa- 
floned by the bladder or no, I made the following expe- 
riment, which, having been often repeated, was con- 
ftantly attended with the fame event. I introduced into 
a bladder, which was fornetimes moift and fometimes 
dry, a quantity of inflammable air, extracted as well from 
zinc as from iron, through water, and having kept it in 
that lituation for feme minutes, beating in the mean 
while the bladder, to keep the air in agitation, I after- 
wards took it out, and by the mixture of nitrous air ob- 
3 ferved 
