Analyfis of the Air. 237 

 I then filled a large earthen veffel 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 our 

 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 5 that 

 water was 7 pounds 6 ounces and ~ equal 

 to 204 cubick inches 5 from which deduft^ 

 ing the fpace occupied by the folid fub- 

 fiance of the lungs, viz. 37 + i cubick 

 inches, there remains 166 -]- f 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 re- 

 pleat with blood and lymph, occupy more 

 fpace than they do in their prefent empty 

 ftate 5 therefore fome allowance muft al- 

 fo be made, out of the above taken cavity 

 of the lungs, for the bulk of thofe fluids 5 

 for which 2 5 -J- f cubick inches feems to 

 be a fufficient proportion, out of the 166 

 -\- ~ cubick inches i fo there remains 141 

 cubick inches for the cavity of the lungs. 



I poured as much water into the Brox- 

 chia as they would take in, which was r 

 pound 8 ounces^ equal to 41 cubick inches 5 



this 



