Analyfts of the Air. 253 
was exhaufted no more than to niake the 
Mercury in the gage rife lefs than 2 inches. 
When I exhaufted the receiver, fo as to raife 
the Mercury 7 or 8 inches, though it made 
the air rufti with much more violence thro" 
thofe fraall apertures in the furface of the 
lungs, yet I did not perceive that the nutar 
ber of thofe apertures was increafed, or at 
leaft very little. An argument that thofe 
apertures were not forcibly made by ex- 
haufting 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 tied down a live Dog on his back, 1 
near the edge of a table, and then made a 
fmali hole thro" the intercoftal mufcles in- 
to his Thorax , near the 'Diaphragm. I ce- 
mented faft into this hole the incutvated 
end of a glafs tube, whofe orifice was co- 
vered with a little cap full of holes, that 
the dilatation of the lungs might not at 
once flop the orifice of the tube. A fmali 
vial full of fpirit of Wine was tied to the 
bottom 
