2 jo Analyfis of the Air. 



thro' thofe fmall apertures in the furface 

 of the lungs, yet I did not perceive that the 

 number of thofe apertures were increafed, 

 or at leaft very little. An argument that 

 thofe apertures were not forcibly made by 

 exhaufting the receiver lefs than two inches, 

 but were originally in the live animal 5 and 

 that the lungs of living animals are fome- 

 times raifed with the like force, efpecially 

 in violent exercife, I found by the follow- 

 ing Experiment, viz. 



Experiment CXIIL 



I ty ed down a live Dog on his back, near the 

 edge of a Table, and then made a fmall hole 

 thro' the intercoftal mufcles into his Tho- 

 rax, near the 'Diaphragm. I cemented faft 

 into this hole the incurvated end of a glafs 

 tube, whofe orifice was covered with a lit- 

 tle cap full of holes, that the dilatation of 

 the lungs might not at once flop the ori- 

 fice of the tube. A fmall vial full of fpirit 

 of Wine was tyed to the bottom of the 

 perpendicular tube, by which means the 

 tube and vial could eafily yield to the mo- 

 tion of the Dog's body, without danger of 



breaking 



