OF THE BRAIN, ETC. 7 



blood propelled through the lungs in a given 

 space of time : in other words, it must bear a 

 relation to the fulness and frequency of the pulse, 

 and the completeness of the respiration. It 

 therefore became necessary to pay particular 

 attention to these circumstances. 



EXPERIMENT IV. 



The experiment was repeated on a dog of a 

 small size, whose pulse was from 130 to 140 in 

 a minute, and whose respirations, as far as I 

 could judge, were performed from 30 to 35 times 

 in a minute. 



The temperature of the room was 63. The 

 heat in the rectum of the animal at the com- 

 mencement of the experiment was 99. The 

 artificial inspirations were made to correspond 

 as nearly as possible to the natural inspirations, 

 both in fulness and frequency. 



At 20 minutes from the time of the division 

 of the spinal chord, the heart acted 140 times in a 

 minute with as much strength and regularity as 

 before : the heat in the rectum had fallen to 96^. 



At 40 minutes the pulse was still 140 in a 

 minute : the heat in the rectum 92^. 



At 55 minutes the pulse was 112, and the heat 

 in the rectum 90. 



At one hour and 10 minutes the pulse beat 

 90 in a minute, and the heat in the rectum 

 was 88. 



At one hour and 25 minutes the pulse had 

 fallen to 30, and the heat in the rectum to 85. 



B 4 



