Atmospheric Air and Oxygen Gas by Respiration. 267 
The register of the water apparatus being noticed, and the 
operator having prepared himself as usual by a forced expira- 
tion, began to respire ; his pulse was 72 ; and at the end of 
9 minutes and twenty seconds, the experiment was concluded 
by a forced expiration, when the pulse was raised to 88. 
Barom. 
Therm. 
Faht. 
Time. 
Cubic Inches 
of oxygen gas 
inspired. 
Cub. Inches 
expired. 
Deficiency. 
29.5 53° 9'-2o" 3 26 ° 3193 6 7 
The operator felt a general glow over the body to the very 
extremities, with a gentle perspiration ; this however went off 
in a few minutes, and no remarkable deviation from the ordi- 
nary state was experienced. 
A portion having been saved, as usual, from each of the 
mercurial gasometers, for an average, 
100 parts contained 
1 1 carbonic acid, 
83 oxygen, 
6 azote. 
100 
The examination repeated, gave the same results. 
Calculation for Carbonic Acid . 
100 : 11 : : 3193 : 351.23, 
consequently, 351.23 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. 
Mm2 
