Analyfis of the Air. 241 
be made, out of the above taken cavity of 
the lungs, for the bulk of thofe fluids . 
for which 25 -j- l cubick inches feems to 
be a fufficient proportion, out of the 166 
4- 4 cubick inches 5 fo there remains 141 
cubick inches for the cavity of the lungs. 
I poured as much water into the Bron~ 
chi# as they would take in, which was 1 
pound 8 ounces, equal to 41 cubick inches; 
this deducted from the above found cavity 
of the lungs, there remains 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 part of an inch diameter 5 then, 
the fum of the furfaces in a cubick inch of 
thefe fmall veficles (fuppofing them to be 
fo many little cubes, for they are not fphe- 
rical) will be 600 fqua**e’ inches ; for if the 
number of the divifions of the fide of the 
cubick inch be ioo 9 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 3 which multiplied 
R by 
