2 1 6 Analjfis of the Air. 



lungs by the following Experiment about 



166 cubick inches, in all 240. 



Thefe effeds of reipiration 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 are 

 admirably contrived by the divine artificer, 

 lb as to make their inward furface to be 

 commenfurate to an expanfe of Air many 

 times greater than the animal's body 5 as will 

 appear from the following eftimate, viz. 



Experiment C1X. 



I took the lungs of a Calf and cut off 

 the heart and windpipe an inch above its 

 branching into the lungs ; 1 got nearly the 

 fpecifkk gravity of the fubftancc of the lungs, 

 (which is a continuation of the branchings 

 of the windpipe, and blood veffds) by find- 

 ing the fpecifkk gravity of the windpipe, 

 which I had cut off 5 it was to Well-water 

 as 1.05 to 1, And a cubick inch of water 

 weighing 254 grains j I thence found by 

 weighing the lungs the whole of their fo- 

 lid fubftancc to be equal to 37 4- \ cubick 

 inches. 



3 I then 



