Messrs. Allen and Pepys on Respiration. 425 
ing sleep, less carbonic acid is evolved than when the animal 
is exercising all its faculties. 
When atmospheric air alone is respired, we have uniformly 
found, that the carbonic acid evolved, added to the oxygen 
remaining, exactly equalled the oxygen existing in the air 
before it was respired, but in the present instance it was one 
per cent, more, a circumstance which we are at present unable 
to account for, but it was constantly the case in all the three 
trials. g; 
Calculation for Azote. 
From the foregoing statement we are enabled to ascertain 
the quantities of azote, both before and after the experiment. 
Azote before the Experiment. 
66 cub. inches atmospheric air, with the animal con- 
tained or - 52,14 
750 of the mixed gasses contained or 49,50 
816 total gas employed 101,64 
The total azote before the experiment was therefore 101,64 
cubic inches. 
Azote after the Experiment. 
Respired during. 
No. 1. 
250. 
15 min. 
100 : 
45 
: 250 : 
1 12,50 
2. 
250. 
13 min. 
100 : 
10,4 
: 250 : 
26 
3 ‘ 
250. 
17 min. 
100 : 
6,5 
: 250 : 
16,25 
66. 
100 : 
6,5 
: 66 : 
4,29 
816 
45 min- 
Azote 
after experiment 
1 59,°4 
Ditto before 101,64 
Increase of azote 
57 * 4 ° 
