Analyfis of the Air. 2 j i 



breaking the tube, which was 3 6 inches long. 

 The event was, that in ordinary infpirations, 

 the fpirit rofe about fix inches in the tube 5 

 but in great and laborious infpirations, it 

 would rife 24 and 30 inches, viz. when I 

 Hopped the Dog's noftrils and mouth, fo that 

 he could not breathe : This Experiment (hews 

 the force with which the lungs are raifed by 

 the dilatation of the Thorax, either in ordi- 

 nary or extraordinary and laborious infpira- 

 tions. When I blew air with fome force in^ 

 to the Thorax % the Dog was juft ready to 

 expire. 



By means of another fhort tube, which 

 had a communication with that which was 

 fixed to the Thorax near its insertion into 

 the Thorax , I could draw the air out of the 

 Thorax, the height of the Mercury, inftead 

 of fpirit in the tube, (hewing to what degree 

 the Thorax was exhaufted of air : The Mer- 

 cury was hereby raifed nine inches, which 

 would gradually fubftde 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 

 affixed to it a bladder full of air, and then 

 continued fucking air out of the Thorax, 



with 



