i^6 Anahjfts of the Air. 



of expanfion of a temperate air, I found by 

 inverting a fmall glafs bubble in water, a 

 little warmer than a thermometer 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 bubble was cool , the quantity 

 of water imbibed by it was equal to \ 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 fenfible veficles, but alfo by their 

 groffnefs much retard the free ingrefs of the 

 air into the veficles, many of which are ex- 

 ceeding fmall, fo as not to be vifible with- 

 out a microfcopej which fumes are alfo con- 

 tinually rebating the elafticity of that air ; 

 then the air in the veficles, will by Exp. 107 

 and 108 lofe its elafticity very faft, and con- 

 fequently 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 



