Franz, Seiisations Following Nerve Division. 235 



On account of the fewness of the spots in the protopathic area it is difficult to 

 see how the protopathic skin would give the hot and cold sensations even 

 from the stimulation of comparatively large areas and how the sensations 

 could be of the same intensity as those from normal parts. Head's observa- 

 tions on the temperature sensations are at variance with those reported by me, 

 but it should be remarked that Trotter and Davies were not only unable 

 to confirm Head's observations, but that, in fact, they obtained results 

 similar to those reported here. 



The matter of the sensibility to light touch needs hold our attention for 

 only a brief time. The gradual increase in sensitivity from the anesthetic area 

 outwards has also been demonstrated by Trotter and Davies in even a more 

 convincing manner than that given by me. They have shown that the sensi- 

 bility of individual touch spots differs at different times during the period of 

 recovery, and it is very plain that the sensory disturbances following the 

 section of a nerve are more widespread than Head and his collaborators admit. 

 It is of some interest to note that a criticism of the cotton wool method of 

 testing light touch has also been made by Trotter and Davies and that for 

 similar tests they used a brush. 



April 26, 1909. 



