Analyfts of the Air. 237 
I then filled a large earthen veflel brim 
full of water, and put the lungs in, which 
I blew up keeping them under water with 
a pewter plate. Then taking the lungs out 
j and letting the plate drop to the bottom of 
the water, I poured in a known quantity of 
water, till the veflel was brimful again $ that 
water was 7 pounds 6 ounces and - equal 
to 204 cubick inches 5 from which deduc- 
ing the fpace occupied by the folid fub- 
ftance of the lungs, viz. 37 -1- -r cubick 
inches, there remains 166 cubick inches 
for the cavity of the lungs. But as the Pul- 
monary Veins, Arteries and Lymphaticks 
! will, when they are in a natural ftate rc- 
' pleat with blood and lymph, occupy more 
I fpace than they do in their prefent empty 
1 ftate 5 therefore fome allowance muft al- 
! fo be made, out of the above taken cavity 
! of the lungs, for the bulk of thofc fluids 5 
: for which 25 cubick inches feems to 
I be a fufficient proportion, out of the 166 
r ~ cubick inches i fo there remains 141 
I cubick inches for the cavity of the lungs. 
I I poured as much water into the Brori- 
I cki£ as they would take in, which was i 
pound % ounces, equal to 41 cubick inches ; 
this 
