240 Analyfis of the /fi r. 



fpecifick gravity of the fubftance of the 

 lungs, (which is a continuation of the branch- 

 ings of the wind-pipe, and blood-veflels) by 

 finding the fpecifick gravity of the wind- 

 pipe, which I had cut off) it was to Well- 

 water as 1.05 to 1. And a cubick inch of 

 water weighing 254 grains; I thence found 

 by weighing the lungs the whole of their 

 folid fubftance to be equal to 37 +| cubick 

 inches. 



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, 

 and letting the plate drop to the bottom of 

 the water, I poured in a known quantity of 

 water, till the veflel was brim-full again ; that 

 water was 7 pounds 6 ounces and ~, equal 

 to 204 cubick inches; from which deduct- 

 ing the fpace occupied '^by the folid fubftance 

 of the lungs, viz. 37 +{. cubick inches, 

 there remains 166 -{"*•£■ cubick inches foj: 

 the cavity of the lungs. But as the Pul- 

 monary Veins, Arteries and Lymphaticks, 

 will, when they are in a natural ftate, re- 

 plete with blood and lymph, occupy more 

 fpace than they do in their prefent empty 

 ftate; therefore fome allowance muft alfo 



be 



