Gases of the Blood 



629 



asphyxia, find the same low gas content as in the blood of dogs 

 subjected to decompression. 



To verify this hypothesis, two methods are possible: 1) to place 

 an animal in a current of air, which becomes progressively poorer 



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in oxygen; 2) to have the animal exhaust a certain quantity of air, 

 getting rid of the carbonic acid, of course, as it is formed. 



The first method seemed to me impractical. To use the second, 

 I fitted to dogs a muzzle which communicated with a bag contain- 



