446 Experiments on the Infiuence of the Brain 
By means of a small thermometer with an exposed bulb, 
I measured the animal heat at different periods. 
At the end of an hotr the thermometer in the rectum had 
fallen from 100° to 94°. : é 
At the end of two hours a small operiing being made in 
the parietes of the thorax, and the ball of the thermometer 
placed in contact with the heart, the mercury fell to 86°, 
and half an hour afterwards in the same situation it fell to 
78°. ae 
In the beginning of the experiment I made an opening 
into the abdomen, and having passed a ligature round each 
artery about two inches below the Kidiiey, Browaht the edges 
of the wound in the abdomen together by means of sutures. 
At the end of the experiment no urine was collected in the 
ureters above the ligatures. 
On examining the blood in the different vessels, it was 
found of a florid-red colour in the arteries, and of a dark 
colour in the veins, as under ordinary circumstances. 
During the first hour and a half of the experiment there 
were constant and powerful contractions of the muscles of 
the trunk and extremities, so that the body of the animal 
was moved in a very remarkable manner, on the table on 
which it lay, and twice there was a copious evacuation of 
feeces. 
Experiment 3.—The experiment was repeated on a rab- 
bit. The temperature of the room was 60°. The respira- 
tions were made from 30 to 35 inaminute. The actions 
of the heart at first were strong and frequent: but at the 
end of one bour and forty minutes the pulse had fallen to 
24 in a minute, 
The blood in the arteries was seen of a florid red, and that 
in the veins of a dark colour. ‘ 
A small opening was made in the abdominal muscles, 
through which the thermometer was introduced into the 
abdomen, and allowed to remain among the viscera. 
At the end of an hour the heat in the abdomen had fallen 
from 100° to 89°. At the end of an hour and forty minutes 
in the same situation the heat had fallen to 85°, and when 
the bulb of the thermometer was placed in the thorax in 
contact with the lungs the mercury fell to 82°. 
It has been a very generally received opinion that the heat 
of warm-blooded animals is dependent on the chemical 
changes produced on the blood by the air in respiration. 
In the two last experiments the animals cooled very rapidly, 
notwithstanding the blood appeared to undergo the usual 
changes 
