Anatyjis of the Air. 141 



be made out of the above taken cavity of 

 the lungs, for the bulk of thofe fluids; for 

 which 25 -f- -r cubick inches feem to be a 

 fufficient proportion, out of the 166 + 4 cu- 

 bick inches; fo there remain 141 cubick 

 inches for the cavity of the lungs. 



I poured as much water into the Bronchite 

 as they would take in, which was one pound 

 eight ounces, equal to 41 cubick inches; 

 this deducted from the above-found cavity 

 of the lungs, there remain 100 cubick 

 inches for the fum of the cavity of the 

 veficles. 



Upon viewing fome of thefe veficles with 

 a microfcope, a middle-fized one feems to 

 be about T i^ part of an inch diameter ; then 

 the fum of the furfaces in a cubick inch of 

 thefe fmall veficles (iuppofing them to be 

 fo many little cubes, for they are not fphe- 

 rical) will be 600 fquare inches; for if the 

 number of the diviiions of the fide of the 

 cubick inch be 100, there will be 100 

 planes, containing each one fquare inch, in 

 each dimenfion of the cube ; which having 

 three dimenfions, the fum of thofe planes 

 will be 300 fquare inches, and the fum of 

 the furfaces of each fide of thofe planes 

 Will be 600 fquare inches ; which multiplied 



R by 



