62 Sir Everard Home’s additional proof s of the 
The parts where the nerves had been divided were care- 
fully dissected and examined by Mr. Mayo, Mr. CLesar 
Hawkins, and myself. The two cut ends of the nerves had 
receded from one another, and the interval between them 
was occupied by a dense newly-formed substance, which had 
become a firm connecting medium, explaining satisfactorily 
the restoration that had taken place in their functions. In 
the former experiment this connecting medium was less 
dense, and left a doubt upon my mind, which is now com- 
pletely removed. 
While engaged in this investigation I have had an oppor- 
tunity, in the course of my professional duty as Surgeon to 
Chelsea Hospital, to ascertain the effect of tying the trunk 
of the artery that supplies the human thigh and leg on one 
side, upon the temperature of the limb, compared with that 
of the other, which remained in a natural state ; and con- 
trasting this with the effect that has been stated to take place 
when the nerve of one horn is divided. 
As I intend to lay before the Society the detail of the 
treatment of this case, of an aneurism in the external iliac 
artery of the right side, which I trust will tend to the ad- 
vancement of the science of Surgery on a future occasion, 
I shall confine myself at present to the effect produced 
upon the temperature of the limb, when the femoral artery 
is obliterated immediately below Popart’s ligament. 
Before the artery was included in a ligature, the tempe- 
rature of the foot, ascertained by a thermometer, was 93 0 ; 
that of the left, which was in a state of perfect health, 84 0 . 
In ten minutes after the operation the heat of the foot fell to 
87° ; in 30 minutes to 85, while the left foot remained at 84°. 
