G90 DR ROBERT KENNEDY ON THE 



and while running about, only once or twice the paw was observed to be turned over 

 on the dorsal surface by the toes scraping the ground, but on these few occasions the 

 normal position was regained at the next step. The position of the leg in standing, 

 Walking", and running, was the same for the affected as for the other leg, and the degree 

 of voluntary extension and flexion at the tibio-tarsal articulation appeared to be the 

 same in the two legs. Only slight atrophy was noted in the muscles, no hair had fallen 

 out, the claws were normal, and two small erosions on the dorsum of the paw, caused 

 by scraping along the floor during the first day that the animal was walking about, 

 were now healed. 



The animal distinctly now felt the prick of a needle in the paw, as, when this was 

 done, it always looked sharply round, and occasionally tried to withdraw the limb, at 

 times attempted to bite, and always turned and licked the paw. In testing the 

 sensation of the paw, sensation on the inside was not taken as evidence of returning 

 function, as this part, as already mentioned, was sensitive from the earliest examination, 

 being innervated by twigs of the saphenous nerve. The difficulty of ascertaining the 

 return of sensation is illustrated by the fact that when pricked on the sound leg or paw 

 the animal often gave no sign. 



On the twenty-first day sensation was considerably improved, as during the exami- 

 nation of the paw the animal's head had to be held, as it frequently snapped when the 

 foot was pricked. 



An attempt was made to ascertain the state of localisation of sensation by blind- 

 folding the animal and attaching a bulldog forceps to the limb, but it was futile, as the 

 animal's first endeavours were always to remove the bandage from its eyes. 



On the thirty-second day the animal was photographed in the standing posture 

 assumed by itself (Plate I. fig. 1). 



On the fifty-fourth day, the dog having been again anaesthetised by chloroform and 

 ether, after having a subcutaneous injection of morphia sulphate, the skull was 

 trephined over the region of the crucial sulcus on both sides, and this region of the 

 brain exposed. Stimulation of the centre for the hind limb on the post-crucial gyrus 

 by a faradic current just to be felt on the tip of the tongue gave no reaction, but when 

 the current was slightly increased, the normal reaction was induced, being the same 

 movement which obtained in the right leg by stimulation of the centre on the left 

 hemisphere. The movement induced was advancement of the leg as in walking, and 

 no other movement could be obtained until the current was further increased, when 

 general convulsions of the body ensued. 



The seat of suture of the nerve was next exposed, and the nerve was found united, 

 there being a neuroma at the seat of reunion. The torsion of the nerve produced at 

 the operation was clearly maintained. The peripheral segment showed this torsion 

 commencing about 3*5 cm. from the seat of reunion. 



Stimulation with a very weak interrupted current induced contractions, when the 

 electrodes were placed above the seat of reunion, on the neuroma, and distal to 



