influence of the Brain on the Action of the Heart , &c. 43 
At 34 minutes the pulse was 120 in a minute ; the heat in 
the abdomen was gf. 
At the end of an hour the pulse could not be felt, but on 
opening the thorax the heart was found acting, but slowly 
and feebly. The heat in the abdomen was 91 0 ; and between 
the lobes of the right lung 88°. 
During the experiment, the blood in the arteries and veins 
was seen to have its usual colour. 
In this therefore, as in the preceding experiments, the heat 
of the animal sunk rapidly, notwithstanding the continuance 
of the respiration. In order to ascertain whether any heat at 
all was generated by this process, I made the following com- 
parative experiment. The temperature of the room being the 
same, I killed the smaller rabbit by dividing the spinal marrow 
between the occiput and atlas. In consequence of the dif- 
ference of size, aeteris paribus, the heat in this rabbit ought to 
diminish more rapidly than in the other ; and I therefore ex- 
amined its temperature at the end of 52 minutes, considering 
that this would be at least equivalent to examining that of the 
larger rabbit at the end of an hour. At 52 minutes from the 
time of the smaller rabbit being killed, the heat among the 
viscera of the abdomen was 92 0 , and between the lobes of the 
right lung it was 91 0 . From this experiment, therefore, it ap- 
peared not only that no heat was generated in the rabbit, in 
which the circulation was maintained by artificial respiration, 
but that it even cooled more rapidly than the dead rabbit. 
At the suggestion of Professor Davy, who took an interest 
in the enquiry, I repeated the foregoing experiment on two 
animals, taking pains to procure them more nearly of the 
same size and colour. 
