JLNrLUENCS OF THE BRAIK ON TH£ ACTIOK OF THE HEART. $65 



domen was 92^, and between the lobes of the right lung it 

 was Ol**. From this experiment, therefore, it appeared, No heat gene, 

 not only that no heat was generated in the rabbit, in which g^iai fespira^ 

 the circulation was maintained by artificial respiration, buttion. 

 that it even cooled more rapidly than the dead rabbit. 



At the suggestion of professor Dary, who took an in- 

 terest in the inquiry, I repeated the foregoing experiment 

 OR two animals, taking pains to procure them more nearly 

 of the same size and colour. 



Exp. 7. I procured two large full grown rabbits of the Exp. 7. Two 

 lame colour, and so nearly equal in size, that no difference ^^qj^uj^e!^^ 

 could be detected by the eye. one artificial 



The temperature of the room was 57°, and the heat in ^pf J^^he ^"^^^ 

 the rectum of each rabbit previous to the experiment other not. 

 was 100|. 



I divided the spinal marrow in one of them, produced 

 artificial respiration, and removed the head after having 

 •ecured the vessels in the neck. The artificial respirations 

 were made about 35 times in a minute. 



During the first hour, the heart contracted 144 times in a 

 minute. 



At the end of an hour ayd a quarter the pulse had fallen 

 to 136 in a minute, and it continued the same at the end of 

 an hour and a half. At the end of an hour and forty mi* 

 nutes the pulse had fallen to 90® in a minute, and the arti. 

 ficial respiration was not continued after this period. 



Half an hour after the spinal marrow was divided, the 

 heat in the rectum had fallen to 97°. 



At 45 minutes the heat was 95f . 



At the end of an hour the heat in the rectum was 94». 



At an hour and a quarter it was 92°. 



At an hour and a half it was 91^. 



At an hour and forty minutes, the heat in the rectum was 

 90i, and in the thorax, within the bag of the pericardium, 

 the heat was 87f . 



The temperature of the room being the same, the second 

 rabbit was killed by dividing the spinal marrow, and the 

 temperature was examined at corresponding periods. 



Half an hour after the rabbit was killed, the heat in ths 

 rectum was 99^. 



At 



