Analyjis of the Air. 255 



to it a bladder full of air, and then conti- 

 nued fucking air out of the Thorax, with a 

 force fufficient to keep the lungs pretty much 

 dilated. As the Mercury fubfided in the 

 gage, I repeated the fuction for a quarter of 

 an hour, till a good part of the air in the 

 bladder was either drawn thro* the fubftance 

 of the lungs into the Thorax, or had loft its 

 elafticity. When I preffed the bladder, the 

 Mercury fubfided the fafter ; the Dog was all 

 the while alive, and would probably have 

 lived much longer, if the Experiment had 

 been continued ; as is likely from the follow- 

 ing Experiment, viz. 



Experiment CXIV. 



I tied a middle-fized Dog down alive on 

 a table, and having laid bare his wind-pipe, 

 I cut it afunder juft below the Larynx, and 

 fixed faft to it the fmall end of a common 

 foflet ; the other end of the foflet had a large 

 bladder tied to it, which contained 162 cu- 

 bick inches -, and to the other end of the 

 bladder was tied the great end of another 

 folTet, whofe orifice was covered with a valve, 

 which opened inward, fo as to admit any air 

 that was blown into the bladder, but none 

 could return that way ; yet for further fecu- 



rity, 



