CHANCES PRODUCED IN AIR BY RESPIRATION. • „ \x)£ 



-time, and hence we infer, that one use of azote is to regu- ^ se of ?zoto 

 late the quantity of oxigen, which shall be taken up in the 

 act of respiration. 



The gas inspired was 320-0 cubic inches, and of this 2*5 

 per cent were azote. 



' 100:2*5:: 3260:81-50. 



The total quantity of azote in the gas inspired wai 

 therefore 81*50 cubic inches. 



The quantity of gas expired was 3193 cubic inches, and 

 of this every 100 parts contained six of azote. 



100:6:: 3193 : 191*58. 



The total quantity of azote in the gas expired was there- 

 fore 191*58 cubic inches; but the total quantity of azote 

 before respiration was only 81*50. 



191-58 — 81*5Q= 110*08; The azote ap- 



« . . , iiiii n parently in- 



therefore 110*08 cubic inches were added by the process of creased during 



respiration, beside what little remained in the lungs after respiration, 

 the experiment, 



Calculation for Oxigen* 



The 3260 cubic inches of gas inspired contained 81*50 Calculation of 

 azote. the oxigen. 



3260 — 81*50 2! 3178*50, 



and consequently the pure oxigen was 3178*50 Cubic 

 inches. The 3193 cubic inches of gas expired contained 

 83 per cent of free oxigen, and 11 per cent ip> carbonic 

 acid gas, making together 94. 



100: 94:: 3193 -.3001*42, 



The oxigen gas, found after the experiment, was therefore 

 3001*42 cubic inches, and deducting this from the oxigen 

 before the experiment^ 



3178*50^3001-42 5= 177*08. 



It appears, at first sight, that 177*08 cubic inches of oxi- Portion mi«s- 

 gen were missing, but great part of this may be accounted * ng ' 

 for, by adverting to the state of the lungs after the experi* 

 merit. 



2 . The 



