440 



hand, and the two last fingers became gradually more elevated until 

 it reached 36 Centigrade. At the same time the temperature of the 

 fingers and outside of the hand became lower, at length reaching 

 28 Cent., where it became stationary. At this time the inner part 

 of the hand presented symptoms of active congestion of blood, being 

 red, and very hot to the touch, and the pulse strong, symptoms 

 the more evident, by comparison with the outer fingers of the same 

 hand, where the temperature was so much lower, and the pulse 

 weak. 



After the removal of the ice from the nerve, sensibility and move- 

 ment returned into the little finger, &c. in a few minutes without the 

 supervention of any hyperaesthesia. 



The restoration of the normal temperature was, however, much 

 more gradual, giving the following results : 



Temperature of skin at the internal and external 



surface of fore-arm at its lower fourth 30 



Temperature of mouth 36 



left hand between last fingers .... 27' 7 



The preceding observations show that considerable advantages 

 may be derived from refrigeration in physiological investigation on 

 man of the functions of the superficial nerves. 



The following are the principal results : 



1 . The first effect of the application of cold to the ulnar nerve on 

 its sensory function is a state of hypersesthesia in the course of 

 the nerve. 



2. This hypersesthesia is succeeded by a state of quiescence or 

 freedom from pain, which is followed by anaesthesia. 



