2?4 Anatyfis of the Air. 
bottom of the perpendicular tube, by which 
means the tube and vial could eafily yield 
to the motion of the Dog's body, without 
danger of breaking the tube, which was }6 
inches long. The event was, that in ordi- 
nary infpirations, the fpirit rofe about fix 
inches in the tube; but in great and labo- 
rious infpirations, it would rife 24 and 36 
inches, viz. when I flopped the Dog’s nof. 
trils and mouth, fo that he could not 
breathe: This Experiment fhews the force 
with which the lungs are raifed by the di- 
latation of the Thorax , either in ordinary 
or extraordinary and laborious infpirations. 
When I blew air with fome force into the 
Thorax , the Dog was juft ready to expire. 
By means of another Ihort tube, which 
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 
Thorax , the height of the Mercury, inftead 
of fpirit in the tube, fliewing to what de- 
gree the Thorax was exhauftcd of air : The 
Mercury was hereby raifed nine inches, 
which would gradually fubfide as the air got 
into the Thorax thro’ the lungs. 
I then laid bare the windpipe, and hav- 
ing cut it off a little below the Larynx, I 
4 affixed 
