48 Mr . Brodie’s Experiments , &c. 
Mr. Home, at my request, was present at the seventh experi- 
ment. Dr. E. N. Bancroft was present at, and assisted me 
in the second experiment ; and Mr. William Brande lent 
me his assistance in the greater part of those which were 
made. I have been further assisted in making the experi- 
ments by Mr. Broughton, surgeon of the Dorsetshire Regi- 
ment of Militia, and Mr. Richard Rawlins, and Mr. Robert 
Gatcombe, students in Surgery. 
I have selected the above from a great number of similar 
experiments, which it would be needless to detail. It is suf- 
ficient to state, that the general results were always the same ; 
and that whether the pulse was frequent or slow, full or small, 
or whether the respirations were frequent or otherwise, there 
was no perceptible difference in the cooling of the animal. 
From the whole we may deduce the following conclusions: 
1. The influence of the brain is not directly necessary to 
the action of the heart. 
2. When the brain is injured or removed, the action of the 
heart ceases, only because respiration is under its influence, 
and if under these circumstances respiration is artificially pro- 
duced, the circulation will still continue. 
3. When the influence of the brain is cut off, the secretion 
of urine appears to cease, and no heat is generated ; notwith- 
standing the functions of respiration, and the circulation of the 
blood continue to be performed, and the usual changes in the 
appearance of the blood are produced in the lungs. 
4. When the air respired is colder than the natural tem- 
perature of the animal, the effect of respiration is not to gene- 
rate, but to diminish animal heat 
