■ Obfervations on inflammable Air. 551 
milled by nitrous air; but if a much larger animal is in- 
troduced into the 400 inches of inflammable air, or a 
fmall animal into a few cubic inches of that air, then it 
will be found to be fenfibly diminifhed by nitrous air; 
and this diminution will be greater as the animal is 
larger in proportion to the quantity of inflammable air. 
A larger animal imparts a greater quantity of its pulmo- 
nary air to the inflammable air; and the inflammable air 
will be found 1 joined to a quantity of pulmonary air, 
which is fo much the lefs as the animal is fmaller. 
Mr. sheele fays, he found that the inflammable 
air after being breathed fome time intirely lofes its in- 
flammability ; from whence he concludes, that the lungs, 
inftead of imparting fome phiogifton to, imbibe it from, 
whatever fubftance it can be exttafted. Though all the 
direft experiments which fhew that a phlogiftic princi- 
ple is continually detached from the lungs, and joins it- 
felf to the common air, were wanting, ftill Mr. sheele’s 
confequence could not be drawn, becaufe the experiment 
is not true. With refpeft to ray own experience I may 
fafely fay, that I have always found it inflammable in 
every circumftance, even after I had breathed it eleven 
times fucceffively : and I have not only found it inflam- 
mable in the bladder, but I have fired it in the aft of :let- 
A a a 2 ting 
