Atmospheric Air and Oxygen Gas by Respiration , 
2 77 
After the Experiment. 
100 
: 66 : 
: 250 
: 165 
oxygen 
in No. 1. 
165 
100 
: 82 : 
: 168 
: 137.76 
in 
No. 13 
137.76 
100 
00 
Or 
: 2944 : 
2399.36 
— — — in 
mixt. 2. to 12. 
2399-36 
— — in 
carbonic acid 
396.78 
— — in 
lungs after expt. 
21 3>57 
3312-47 
3370.66 original oxygen, — 
3312.47 after experiment, 
38.19 deficiency. 
The observed deficiency in this experiment was 58. 
The deficiency in this case, and in the former experiment 
with oxygen, though comparatively small, when Contrasted 
with the quantity of gas respired, is larger than the average 
with atmospheric air ; it seems probable, therefore, that a por- 
tion may be detained in the system. It must be remembered 
that what we call residual gas, is not only that contained in 
the substance of the lungs, and in its appendages, but also that 
contained in the fauces and mouth. 
Eighteenth Experiment. 
Cubic inches 
expired. 
Deficiency. 
Cub. inches 
Barom. Therm. Time. of oxygen gas 
inspired. 
30.13 70 s 3130 3060 70. 
The operator breathed as usual, after having made a strong 
effort to exhaust his lungs ; his pulse before the experiment 
was 84, the thermometer under his tongue 38° : after the ex- 
periment his pulse was 36, and the thermometer under his 
