420 Messrs. Allen and Pepys on Respiration. 
Summary of the Experiment. 
Gas before Gas after Defici- Carbonic Cubic Inches Oxygen Azote 
Therm. Esper. Exper, ciency. Acid found, per Minute. Time. missing. added 
h /' 
o 
56 816 8 1 4. 2 78,91 1,11 1 11 36,20 34,20 
The quantity of azote added, of oxygen missing, and of car- 
bonic acid formed, were smaller than in the last experiment ; 
but the animal in this instance was smaller, as well as the quan- 
tity of oxygen passed through in a given time. 
In this case, as in the human subject, the increase of azote 
takes place principally in the early periods. The whole azote 
contained in the 66 cubic inches, confined with the pig, was 
only 52,14, but supposing, which perhaps was not the case, 
that the 66 of common air were expelled by the first 250 cubic 
inches of oxygen, we should have 250 
less 66 
184 of oxygen, 
containing 5 per cent, azote, or 9,20 cubic inches ; these added 
to the 52,14, would make 61,34 °f azote to be found in the 
first gasometer of respired gas, but we detected 75, so that 
even on this supposition 13,66 of azote were added in the first 
twenty-four minutes. 
The azote contained in the second gasometer before respi- 
ration, was 12,50 cubic inches, but after it had been respired 
for twenty-three minutes, we found 23,75, or an increase of 
11,25 azote. The azote contained in the third gasometer, be- 
fore respiration, was, as before, 1 2,50 cubic inches ; but after it 
had been respired for twenty-four minutes, we found 20, or 
an increase of 7,50 azote. 
The azote contained in the 66 cubic inches, was 3,30, but 
we found 5,28, or an increase of 1,98 azote. 
