426 Messrs. Allen and Pepys on Respiration. 
Calculation for Hydrogen. 
Hydrogen before Experiment. 
The mixture before the experiment was found to contain 
71,4 hydrogen. 
100 : 714 : : 750 : 535,5 0 
therefore the total quantity must be 535,50 cubic inches. 
Hydrogen after Experiment. 
No. 1. 250 100 : 32 : : 250 : 80 
2. 250 100 : 66,6 : : 250 : 166,50 
3. 250 100 : 70,5 : ; 250 : 176,25 
66 in A 100: 70,5 : : 66 : 46,53 
Hydrogen found after experiment 469,28 
Hydrogen before the experiment 535,50 
Ditto after - 469,28 
Loss of hydrogen, - - 66,22 
In this experiment, as well as in those with oxygen, the pro- 
portion of azote evolved, was greater in the early than in the 
later periods, and it becomes interesting to contrast them : 
thus we know that 52,14 cubic inches of azote were in the 
vessel with the animal at the be- 
ginning of the experiment, and 
that, of the 250 cubic inches of 
mixed gases passed in the first 
fifteen minutes, only 184 could 
be expelled into gasometer C, 
( 100 : 6,6 : : 184: 12,14.) which 
contained only 12,14 
making together 64,28 of azote, which was all that 
