«}• On Respiration, 



imd three quarters : the animal did not seem to be in the 

 kast incommoded. 



A third quantity of 250 cubic in«hes was passed, in about 

 sixteen minutes. 



And a fourth quantity of 250 cubic inches in eleven mi- 

 nutes and three quarters j but during this time the animal 

 became very sleepy, and towards the end of the experiment 

 •kept his eyes constantly shut ; he, however, appeared to 

 suffer nothing, and was easily roused tor a short lime by 

 rapping at the side of the glass. At the end of sixty-one 

 minutes and a half he was taken out, and we found that 

 during this time he had produced 60-20 cubic inches of 

 carbonic acid gas, or rather less than one cubic inch in a 

 minute. 



ft appears, that less carbonic acid was evolved in this in- 

 stance in a given time, than when oxygen was respired, 

 but some circumstances occurred to prevent us from dis- 

 covering what change the azote had experienced : this point 

 was, howeycr, decided by the following experiment. 



Experiment J. Hydrogen and Oxygen. 



Having mixed hydrogen and oxygen gases in such pro- 

 portion as that the oxygen should rather exceed the quan- 

 tity contained in atmospheric air, we placed the same ani- 

 mal in the glass A with 66 cubic inches of atmospheric air. 

 250 cubic inches of the mixture were admitted into gaso- 

 meter B, from the large water gasometer, and gradually 

 passed through the glass A into gasometer C, during fifteen 

 minutes. The pig did not appear uneasy, and the respired 

 gas measured 250 in C : a portion of this was preserved tor 

 examination, v,hich we shall call No. 1. 



250 cubic inches more of the mixture were admitted in- 

 to B, and gradually passed, as before, during thirteen mi- 

 nutes ; it measured 250 in C; and a portion No. 2 wa» 

 preserved for examination. 



The animal did not seem to suffer any inconvenience. 

 250 cubic inches more of the mixture were admitted into B, 

 and gradually passed, as before, through A into C during 

 seventeen njuutes. The animal now became quite sleepy, 

 but did not ajiptar to suffer any thing. He was taken out 

 It the end of forty minutes. 



At the close of the experiment, the remains of the mix- 

 lure, which had stood about an hour in the large water 

 gasometer, being examined, was found to contain 22 per 

 cent, of oxygen and no carbonic acid ; of the residual 79 

 parts, 20 were mixed with 10 of oxygen, which had been 



previouily^ 



