2 j 6 Anahyfis of the Air. 
withftanding the fame quantity of abforb- 
ing fubftances would, in a larger quantity 
of air, have abforbed much more air ; and 
this is the reafon why I was never able to 
deftroy the whole elafticity of any included 
bulk of air, whether it was common air, 
or new generated air. 
Experiment CVII. 
j May i 8, which was a very hot day, I 
repeated Dr. Mayow’s Experiment, to find 
how much air is abforbed by the breath of 
Animals inclofed in glafles, which he found 
with a moufe to be - 1 -? part of the whole 
air in the glafs veffel, ‘De Sp. Nitro aereO) 
$• 104. 
I placed on the pedeftal, under the inver- 
ted glafs z z a a> (Fig. 3 5 .) a full grown 
Rat. At firft the water fubfided a little, 
which was occafioned by the rarifaftion of 
the air, caufed by the heat of the animal’s 
body. But after a few minutes the water be- 
gan to rife, and continued riling as long 
as the Rat lived, which was about 14 hours. 
The bulk of the air in which the Rat 
lived fo many hours was 2024 cubick inches ; 
the quantity of elaftick air which was ab- 
forbed was 7 3 cubick inches, above ?, part 
' of 
