ij 8 Analyfis of the Air. 



Experiment CVIII. 



The following Experiment will {hew, 

 that the elafticity of the air is greatly de- 

 ftroyed by the refpiration of human Lungs 5 

 viz. 



I made a bladder very fupple by wetting 

 of it, and then cut off fo much of the neck 

 as would make a hole wide enough for the 

 biggeft end of the largeft foffet to enter, to 

 which the bladder was bound fait. The 

 bladder and foffet contained 74 cubick 

 inches. Having blown up the bladder, I 

 put the fmall end of the foffet into my 

 mouth; 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 considerable 

 difficulty in breathing, and was forced after 

 that to fetch my breath very faft; and at 

 the end of the minute, the fuffocating un- 

 eafinefs was fo great, that I was forced to 

 take awav the bladder from my mouth. 

 Towards the end of the minute the blad- 

 der was become fo flaccid, that I could not 

 blow it above half full with, the greatefl 

 expiration that I could make : And at the 



fame 



