MESSRS. ALLEN AND PEPYS ON THE RESPIRATION OF BIRDS. 285 



Duration of 

 Iheexpt. 



6' at 1' after 3 p.m. made 36 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 17 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 



thccxpt. gas after Carbonic 



cub. inch. Azote. Oxygen. Hydrog. Time. expt. Azote. Oxygen. Acid. HyAiog, 



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 25 1 cubic inches of gas. 



Before the experiment 61.53 



Found after the experiment 34.15 



In carbonic acid 17.62 



5177 



The volume nearly the same after as before the experiment. 

 Hydrogen in the 25 1 cubic inches of gas. 



Before the experiment 147-73 



Found after the experiment 112.25 



»> 



Loss of hydrogen 35.48 



17.62 -i- 26' = .68 cubic inches per minute. 



