Atmospheric Air and Oxygen Gas by Respiration . 265 
It appears, therefore, that 24.42 cubic inches of oxygen had 
been absorbed by the system under the circumstances of this 
experiment. 
Reviewing the 14th experiment, it appears that the gas 
after respiration contained 85 per cent, azote, and 15 per 
cent, oxygen, either in the state of carbonic acid, or free. 
State of the Air before the Experiment. 
300 = 237 azote -f- 63 oxygen. 
After the Experiment. 
85 : 15 : : 237 : 41.82. 
The total quantity of oxygen after the experiment appears to 
be 41.82 cubic inches. 
Then 237 azote -j- 41.82 oxygen = 278.82. 
The total volume after the experiment appears to be 278.82 
cubic inches. 
300 — 278.82 = 21.18. 
The loss of oxygen in this case was 21.18 cubic inches. 
We are disposed to consider the 11th as a standard experi- 
ment relative to carbonic acid gas, because the quantity of 
air respired in a given time is pretty near the average of the 
first ten experiments ; and because it very nearly agrees with 
the statement of Professor Davy. In this experiment 292 
cubic inches of carbonic acid gas were given off' in eleven 
minutes ; the barometer was 30.4, the thermometer 50°, the 
volume being calculated at the mean, viz. barometer 30, 
thermometer 6o°, will be 302 cubic inches given off in eleven 
minutes, or 39534 cubic inches in twenty-four hours, sup- 
posing the production to be uniform during all that period ; 
mdcccviii. M m 
