ANIMAL HEAT. 113 



and 206-5 ; and 209*16 and 109-99 in a third. 

 This difference is probably to be attributed, in 

 great measure, to the greater or less extent of 

 the internal hemorrhage. If we take the average 

 of the whole of M. Le Gallois's experiments, we 

 find that the carbonic acid produced by natural 

 respiration, in 30 minutes, was 233*94, and that 

 by artificial respiration 181*67 cubic centimetres ; 

 the proportion of the latter to the former being 

 actually larger than it was in the corresponding 

 experiment made by myself. * Taking all these 

 circumstances into consideration, I apprehend 

 that the results obtained by M. Le Gallois, instead 

 of contradicting, must be considered as confirm- 

 ing those which I had obtained previously, and as 

 justifying the opinion that if he had conducted 

 his experiments so as to avoid the disturbing 

 influences connected with the mechanical de- 

 struction of the functions of the brain, he would 

 have found, as I did, that the exhalation of 

 carbonic acid, when respiration was performed 

 artificially, fully equalled that which took place 

 when the animal was in its natural condition. 



In pursuing these investigations, I assumed 

 that the carbonic acid, generated in respiration, 

 may be taken as the measure of the oxygen con- 



* If we suppose 100 to represent the quantity of air 

 consumed in natural respiration, the proportion borne by 

 that to the air consumed in artificial respiration in my first 

 experiment after the division of the spinal chord, nerves, and 

 vessels in the neck, was nearly as 100 : 74 ; and in M. Le 

 Gallois' experiments, as 100 : 77. 



I 



