Anahfts of the Air. 2 3 j 
and foflet contained 74 cubick inches. Hav. 
ing blown up the bladder , I put the (mall 
end of the foflet into my mouth 5 and at 
the fame time pinched my noflrils clofe 
that no air might pafs that way , fo that 
I could only breath to and fro the air 
contained in the bladder. In lefs than half 
a minute I found a confiderable difficulty 
in breathing, and was forced after that to 
fetch my breath very fall 5 and at the end of 
the minute, the fuffocating uneafinefs was 
fo great, that I was forced to take away the 
bladder from my mouth. Towards the end 
of the minute, the bladder was become fo 
flaccid, that I could not blow it above half 
full with the.greateft expiration that I could 
make : And at the fame time I could plain- 
ly perceive that my lungs were much fallen, 
juft in the fame manner as when we breath 
out of them all the air we can at once. 
Whence it is plain that a confiderable quan- 
tity of the elafticity of the air contained 
in my lungs, and in the bladder was de- 
. jftroyed : Which fuppofing it to be 20 cu- 
bick inches, it will be o part of the whole 
Air, which I breathed to and fro; for the 
bladder contained 74 cubick inches, and the 
Inmrs 
