17S Mr . Cruikshank's Experiments on the Nerves 
tals. The original trunks continue their course by the sides of 
the lumbar vertebrae ; after which, they run before the os 
sacrum, and, approaching nearer each other as they descend, 
terminate before.ihe os coccygis, in the ganglion coccygeum 
impar of Walther. Their branches all go to the heart, ab- 
dominal viscera, testicles in men, and ovaria and uterus in 
women. The trunks of these nerves are largest in the neck. 
In the human species, the two nerves of each side are distinct; 
but in those quadrupeds which I have examined, they are so 
closely connected through the whole length of the neck, as to 
make apparently but one nerve. The intercostal is the smallest 
nerve, and adheres so closely to the other, as to be with diffi- 
culty separated from it. They seem to me, likewise, larger in 
the dog, compared with his bulk, than in the human subject. 
The neck was the place in which I chose to divide these nerves ; 
it was there they could be got at with least danger, a circum- 
stance which, by making an experiment more simple, makes 
it consequently more to be relied on ; and, in order to put the 
animal to as little pain as possible, and make the operations 
short, I chose to divide both nerves at once, rather than take 
up time in separating them, and dividing them singly; so that, 
instead of four operations on each animal, I confined myself to 
two. Instead of mentioning the names of the gentlemen pre- 
sent at each experiment, I shall observe once for all, that two 
or more of the following gentlemen were present at each expe- 
riment, except experiment VII, which I performed, assisted by 
Mr. Hunter's servant only : — Messrs. Barforth, Bayley, 
Davidson, Hartley, Hawkins, Home, Kuhn, Noble, Par- 
ry, Martin, Sheldon, Wheatly ; besides others, who came 
in occasionally, during the time of the experiments, or who 
