Atmospheric Air and Oxygen Gas by Respiration. 275 
The total quantity of carbonic acid gas emitted, was therefore 
396.78 cubic inches. 
Calculation for Azote. 
100 : 25 : : 250 : 62.50 Azote in No. 1. 62.50 
100 : 5.5 : : 168 : 9.24 in No. 13. 9.24 
100 : 6.5 : : 2944 : 191,36 in mixt. 2. to 12. 19136 
263.10 
The azote expired, beside what might be contained in the 
lungs, at the close of the experiment, was therefore 263.10 
cubic inches. Here it is plain, that the operator, at the begin- 
ning of this experiment, had not brought his lungs to the 
same state as in the preceding ; or that in consequence of 
fatigue, and want of refreshment for several hours, the pro- 
portion of azote in the lungs might be greater. 
Every 100 parts of oxygen, before it was inspired, con- 
tained 2.5 azote. 
100 : 2.5 : : 3420 : 85.50 ; 
Consequently it contained 85.50 cubic inches of azote. 
From 263.10 
Deduct 85.50 the original azote, 
177.60 will be left for the increase of azote. 
Then supposing as before, that the quality of the air in the 
lungs, before the experiment was 84 per cent, azote, 16 
oxygen, and after the experiment 5.5 per cent, azote, 94.5 
oxygen, as found in the last gasometer, we take 
— azote at the beginning , 
IOO O & 7 
— azote at the end ; 
JOO ’ 
N n 2 
