

IN 



3 



8 



Analyfis of the Air. 



iri* 



* 





this deducted from the above found cavity grf* 

 of the lungs, there remains ioo cubick inches \$fi? z * 

 for the fum of the cavity of the veficles. [p b** 



Upon viewing fomc of thefe veficles with , ; r>" r : 

 a microfcope, a middle fized one feems to^fttol 

 be about t4» part of an inch diameter 5 then £#.. 

 the fum of the furfaccs in a cubick inch ,- (OB 

 of thefe fmali veficles (fuppofing them to be ' \\|c 

 fo many little cubes, for they arc not fphe-"'" . 

 rical) will be 300 fquare inches ; which mul-\" f fl 

 tiplied by the fum of the cavity of all the ' 

 veficles in the lungs, <viz. 100 cubick inches, 

 will produce 30000 fquare inches ; one** 

 third of which muft be deducted, to make'** 21 * 

 an allowance for the abfence of two fides | 

 in each little veficular cube, that there '«M ( 

 mi^ht be a free communication among j . 

 them for the Air to pafs to and fro j fo 

 there remains 20000 fquare inches for the ■- _• . . 

 fum of the furface of all the veficles. ^ l 



And the Bronchia containing 41 cubick ^ ^ 

 inches , fuppofing them at a medium to ^ 

 be cylinders of -V of an inch diameter, their ,^> 

 furface will be 1635 fquare inches, which . 

 added to the furface of the veficles makes £*■ 

 the fum of the furface of the whole T^ 



Jungs to be 21635 Square inches, or ^ 



