MESSRS. ALLEN AND PEPYS ON THE RESPIRATION OF BIRDS. 285 
Duration of 
the expt. t t 
6' at 1' after 3 p.m. made 35 cubic inches of the mixture pass slowly 
through the vessel. 
10 at 5 after 3 p.m. passed 35 cubic inches more ; the bird became uneasy. 
15 at 10 after 3 p.m. passed 35 cubic inches more. 
18 at 13 after 3 p.m. the bird now panted very much, but was relieved as 
soon as more of the mixture was admitted, passed 
35 cubic inches. 
22 at 1 7 after 3 p.m. passed 35 cubic inches more. 
23 at 18 after 3 p.m. passed 12 inches ; being the last the bird struggled. 
26 at 21 after 3 p.m. took it out, but it did not seem to be in the least injured. 
The following was the state of the gas before and after the experiment : 
Vol. of 
gas before Vol. of 
the expt. gas after Carbonic 
cub. inch. Azote. Oxygen. Hydrog. Time. expt. Azote. Oxygen. Acid. Hydrog. 
64.00 atmos. air — 50.56 13.44 
39.27 oxygen 3 per cent = 1.18 38.09 
147.73 hydrogen 147.73 26' 250.99 = 86.97 34.15 17.62 112.25 
51.74 51.53 
251.00 
Azote in the 251 cubic inches of gas. 
Before the experiment 5 1 .74 
Found after the experiment 86.97 
Increase of azote 35.23 
Oxygen in the 251 cubic inches of gas. 
Before the experiment 51.53 
Found after the experiment 34.15 
In carbonic acid 17-62 
51.77 
The volume nearly the same after as before the experiment. 
Hydrogen in the 251 cubic inches of gas. 
Before the experiment 147-73 
Found after the experiment 112.25 
Loss of hydrogen 35.48 
17-62 26' = .68 cubic inches per minute. 
