146 Analyfts of the Ah\ 
of cxpanfion of a temperate air, I found by 
inverting a fmall glafs bubble in water, a 
little warmer than a T^hermometer is, by ha- 
ving its ball held fome time in the mouth, 
which may reafonably be taken for the de- 
gree of warmth in the cavity of the lungs. 
When the babble was cool , the quantity 
of water imbibed by it was equal to i of 
the cavity of the whole bubble. 
But when inftead of thefe frequent re- 
cruits of frefh air, there is infpired an air, 
furcharged with acid fumes and vapours, 
which not only by their acidity contrad the 
exquifitely fcnfiblc veficles, but alfo by their 
groffnefs much retard the free ingrefs of the 
air into the veficles, many of which arc ex- 
ceeding fmall, fo as not to be vifible with- 
out a microfcopc; which fumes are alfo con- 
tinually rebating the elafticity of that air ; 
then the air in the veficles, will by Exp. 107 
and icS iofc its elafticity very faft, and con- 
fcquently the veficles will fall flat, notwith- 
ftanding the endeavours of the extending 
thorax to dilate them as ufual 5 whereby 
the motion of the blood thro’ the lungs, be- 
ing flopped, inftant death enfues. 
Which 
