and Oxygen Gas I'y Respiration* $57 



Calculation for Carbonic Acid. 

 100 : 11 : : 3193 : 351*23, 

 Consequently, 35T23 cubic inches of carbonic acid gas were 

 formed in 9'-20", or 37*64 cubic inches in a minute. 



Here it -is plain that a greater quantity of carbonic acid 

 was formed from oxygen than from common air, in the 

 same time ; and hence we infer, that one use of azote is to 

 regulate the quantity of oxygen, which shall be taken up in 

 the act of respiration. 



The gas inspired was 3260 cubic inches, and of this 2*5 

 per cent, was azote. 



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

 The total quantity of azote in the gas inspired, was there-" 

 fore 81*50 cubic inches. 



The quantity of gas expired was 3103 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 be- 

 fore respiration was only 81*50, 



191-58 — 81*50 = 110*08; 

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

 respiration, beside what little remained in the lungs after the 

 experiment. 



Calculation for Oxygen. 



The 3260 cubic inches of gas inspired contained 81*50 azote. 



3260 — 81*50 == 3178*50, 

 and consequently the pure oxygen was 3178*50 cubic inches. 

 The 3193 cubic inches of gas expired, contained 83 per cent, 

 of free oxygen, and 1 1 per cent, in carbonic acid gas, making 

 together 94. 



100 : 94 : : 3193 : 3001*42. 



The oxygen gas, found after the experiment, was there- 

 fore 3001*4 2 cubic inches, and deducting this from the oxy- 

 gen before the experiment, 



3178*50 ~ 3001*42 = 177'C8. 

 It appears, at first sight, that 177'08 cubic inches of oxygen, 

 were missing, but great part of this may be accounted for, by 

 adverting to the state of the lungs after the experiment. 



Vol. 32, No, 127.. Dec, 1808. R The 



