Analyfis of the Air. 253 

 ther fecurity, that paffage was alfo flopped 

 with a fpiggot. 



As foon as the firft foffet was tyed faft to 

 the windpipe, the bladder was blown full of 

 air thro* the other foffet 5 when the Dog had 

 breathed the ait in the bladder to and fro 

 for a minute or two, he then breathed very 

 faft, and fhewed great uneafinefs, as being 

 almoft fuffocated. 



Then with my hand I preffed the blad- 

 der hard, fo as to drive the air into his lungs 

 with fome force 5 and thereby make b\$ Ab- 

 domen rife by the preffure of the 'Diaphragm, 

 as in natural breathings : Then taking alter- 

 nately my hand off the bladder, the lungs 

 with the Abdomen fubfided -, I continued in 

 this manner, to make the Dog breathe for 

 an hour 5 during which time I was ob- 

 liged to blow frefh air into the bladder every 

 five minutes, three parts in four of that air 

 being either abforbed by the vapours of the 

 lungs, or efcaping thro' the ligatures, upon 

 my preffing hard on the bladder. 



During this hour, the Dog was frequently 

 near expiring whenever I preffed the air 

 but weakly into his lungs 5 as I found by 

 his pulfe, which was very plain to be fek 



in 



