i^z Analyjis of the Air. 
veficls, by generating or abfoibing mixtures.' 
As in the mixture of regia and Anti- 
wony in Experiment 91? by enlarging the 
bulk of the air in the vcffcl, a greater quan- 
tity of air was abforbed. Thus' alfo filings 
of Iron and Brimjloney which in a more ca- 
pacious vcflel abforbed 19 cubick inches 
of air, abforbed very little when the bulk 
of air above the ingredients was but 3 or 
4 cubick inches : For 1 have often obfcrved> 
that when any quantity of air is faturated 
with abforbing vapours to a certain degree, 
then no more elaflickairis abforbed: Not- 
withftanding the fame quantity of abforb- 
ing fubftances would, in a larger quantity 
of air, have abforbed much more air 5 and 
this is the reafon why I was never able to 
deftroy the whole dafticity of any included 
bulk of air, whether it was common air, 
or ne .5 generated air. 
Experiment CVIL 
May 18, which was a very hot day, i 
repeated Dr. Mayow'^ Experiment, to fmd^ 
how much air is abforbed by the breath of 
Animals inciofedin glaiTes, which he found 
with a moufe to be part of the whole 
air 
