nerves and ganglions in producing animal heat. 259 
animals possessed of an unusual temperature were devoid of 
nerves ; the heat of the deer's horn while inclosed in its 
velvet in June 1824, when only one foot long, I found to be 
96°, and on the 12th of July the tip of an antler was 99^; 
from which it was evident that these horns during their 
growth have a power of producing heat, independent of the 
direct influence of the brain or heart ; and therefore it was 
only necessary to ascertain whether there are nerves accom- 
panying their blood vessels, which Mr. Bauer not only ascer- 
tained to be the case, but found them equally numerous with 
the arteries themselves. 
This discovery enabled me to institute an experiment, which 
at once would decide in what degree animal heat was under 
the influence of ganglionic nerves. 
As I might be considered too partial an evidence respect- 
ing the different results arising out of such an experiment, I 
contented myself with superintending it, and made over the 
operative part to Mr. Mayo, and his associate Mr. C^sar 
Hawkins, teachers of Anatomy in Berwick-street. The 
experiment was to consist in dividing all the trunks of the 
nerves that supplied the velvet of one horn, while those of 
the other horn were left entire ; and see how far under these 
circumstances the horn would be liable to any diminution of 
its heat. 
The first thing required was to examine into the number 
of such nervous trunks, and the situations in which they 
were to be met with. This was done in the head of a deer 
with antlers, after death. 
The experiment was made in Richmond Park on the 21st 
of July, 1824, about noon, having the dissected nerves be- 
MDcccxxv. M m 
