AnaJyJis of the Ait . 259 



fame time I could plainly perceive, that my 

 lungs were much fallen, juft in the fame 

 manner as when we breath out of them 

 all the air we can at once. Whence it is 

 plain that a confiderable quantity of the 

 elafticity of the air contained in my lungs, 

 and in the bladder, was deftroyed; which 

 fuppofing it to be 20 cubick inches, it will 

 be ^ part of the whole air, which I breath- 

 ed to and fro; for the bladder contained 

 74 cubick inches, and the lungs, by the 

 following Experiment, about 166 cubick 

 inches, in all 240. 



Thefe effects of refpiration on the ela- 

 fticity of the air put me upon making an 

 -attempt to meafure the inward furface of 

 the lungs, which by a wonderful artifice 

 are admirably contrived by the divine Ar- 

 tificer, fo as to make their inward furface 

 to be commenfurate to an expanfe of air 

 many times greater than the animal's body; 

 as will appear from the following eflimate, 

 i)iz. 



Experiment CIX. 



I took the lungs of a Calf, and cut off 

 the heart and wind-pipe an inch above its 

 branching into the lungs; I got nearly the 



fpecific^ 



