2^6 /Imlyfis of the Air. 
lungs by the following Experiment about 
1 66 cubick inches, in all 240. 
Thefe efFeds of refpiration on the elafti- 
city of the air, put me upon making an at- 
tempt to meafure the inward furface of the 
lungs , which by a wonderful artifice arc 
admirably contrived by the divine artificer, 
fo as to make their inward furface to be 
commenfurate to an expanfe of Air many 
times greater than the animars body 5 as will 
appear from the following eftimate, 
Experiment CIX. 
I took the lungs of a Calf and cut off 
the heart and windpipe an inch above its 
branching into the lungs i I got nearly the | 
fpecifick gravity of the fubftance of the lungs, | 
(which is a continuation of the branchings j 
of the windpipe, and blood vcffels) by find- 1 
ing the fpecifick gravity of the windpipe, 
whicl\ I had cut off; it was to Well-water 
as 1.05 to I, And a cubick inch of water ' 
weighing 254 grains j I thence found by 
weighing; the lungs the whole of their fo- 
lid fubftance to be equal to 37 + J cubick 
inches, 
3 
I then ; 
