2 j 6 Analyfis of the Air. 
for further fecurity, that paffage was alfo 
flopped with a fpiggot. 
As foon as the firft foffet was tied fail to 
the wind- pipe, the bladder was blown full of 
air thro’ the other foffet ; when the Dog had 
breathed the air in the bladder to and fro 
for a minute or two, he then breathed very 
faft, and (hewed 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 fomc force ; and thereby make his 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 obliged 
to blow frefh air into the bladder every five 
minutes, three parts in four of that air be- 
ing 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; as 1 found by 
his pulfe, which was very plain to be felt 
in the great crural artery near the groin, 
which 
