Anahfis of the Air. 2 3 j 



and foffet contained 74 cubick inches. Hav- 

 ing blown up the bladder , I put the (mall 

 end of the foffet into my mouth 5 and at 

 the fame time pinched my noftrils clofe 

 that no air might pafs that way , fo that 

 I could only breath to and fro the air 

 contained in the bladder. In iefs than half 

 a minute I found a confiderable difficulty 

 in breathing, and was forced after that to 

 fetch my breath very fad 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 greater!: expiration that I could 

 make : x\nd 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- 

 ftroyed : Which fuppofing it to be 20 cu- 

 bick inches, it will be l % part of the whole 

 Air, which I breathed to and fro; for the 

 bladder contained 74 cubick inches, and the 



lungs 



