^ • Analjfts of the Air. 251 
[ breaking the tube, which was 3 6 inches long. 
The event was, that in ordinary infpirations, 
I the rpirit rofe about fix inches in the tube; 
but in great and laborious infpirations, it 
would rife 24 and 30 inches, when I 
flopped the Dog's noftrils and mouth, fo that 
he could not breathe : This Experiment (hews 
the force with v/hich the lungs are raifed by 
the dilatation of the Thorax^ cither in ordi- 
nary or extraordinary and laborious infpira-^ 
tions. When I blew air with fome force in- 
to the Thorax^ the Dog was jufl ready to 
expire. 
; By means of another fiiort tube, which 
I had a communication with that which was 
fixed to the Thorax near its infertion into 
the Thorax , I could draw the air out of the 
I Thorax^ the height of the Mercury, inflead 
of fpirit in the tube, Ihewingto what degree 
it the Thorax was e^haufted of air : The Mer- 
cury was hereby raifed nine inches, which 
would gradually fubfide as the air got into 
the Thorax thro' the lungs. 
I then layed bare the windpipe, and ha- 
ving cut it off a little below the Larynx, I 
I affixed to it a bladder full of air, and then 
j ^ontffiued fucking air put of the Thorax, 
' with 
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