338 ^^ hespiration. 



would occur when hidrogcn was substituted for azote. We 

 accordingly made a mixture containing 22 per cent oxigen, 

 and 78 hidrogen. 



Experiment 6. Hidrogen and Oxigen. 



Experiment 6. The pig employed in the last'^expcrimcnt was placed upon 



wulfSdro^'e^n ^^^ ^^^^^ ^" *'^® S^^^^ ^^ ^"^'^^^ ^^ ^^^^^^ inches of commort 

 air as usual. 



250 cubic inches of the mixture were passed from the ga- 

 someter communicating with B, through the glass A, into 

 the gasometer communicating with C, during sixteen mi- 

 nutes. The animal did not appear uneasy : a second 

 quantity of 250 cubic inches was passed in seventeen mi- 

 nutes and three quarters: the animal did not seem to be in 

 the least incommoded. 



A third quantity of 250 cubic inches was passed, in about 

 sixteen minutes. 



A fourth quantity of 250 cubic inches in eleven minutes 



and three quarters ; 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 for a short time 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 6020 cubic inches of carbonic 



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



Less carbonic It appears, that less carbonic acid was evolved in this in- 



acid evolved gtancc in a given time, than when oxigen was respired but 



than with ° , 



oxigen. somc circumstances occurred to prevent us from discovering 



what change the azote had experienced: this point was, 



however, decided by the following experiment. 



Experiment 7. Hidrogen and Oxigen. 

 Experiment 7. Having mixed hidrogen and oxigen gases in such propor- 

 hidropen^"^* tion, as that the oxigen should rather exceed the quantity 

 contained in atmospheric air, we placed the same animal in 

 the glass A with 66 cubic inches of atmospheric air. 250 

 cubic inches oi the mixture were admitted into gasometer B, 

 from the large water gasometer, and gradually passed through 

 the glass A into gasometer C, during fifteen minutes. The 



P'g 



hidrogen. 



