678 HUBER. [Vol. XI. 



Operation. — The ulnar of the right side was exposed, and 6 ctm. 

 removed ; a segment of equal length taken from a cat's sciatic was im- 

 planted, sutured above and below with a single catgut suture, and wound 

 closed. 



Jan. 31. Two epidermal stitches had given way. The wound healed a 

 few days later, 

 Exatntnatioti. — June 23, 1894 (121 days after operation). 



There were no trophic ulcers on the foot. The dog used the foot very 

 well in walking up and down stairs. Exposing the nerves showed the 

 peripheral end of the central ulnar stump to be slightly bulbous. The 

 peripheral ulnar was normal in appearance, and the implanted segment 

 firmly imbedded in fibrous tissue. 



Physiological tests : — 



(i) Stimulation with induction shocks at 15 ctm. S. C. of peripheral 

 ulnar below implanted segment excited contractions of muscles supplied by 

 the ulnar ; and evidence of pain was shown by the reflexes, but the latter 

 were not very marked. 



(2) After severing the central ulnar stump about 6 ctm. above the 

 central wound, and cutting the median and musculo-spiral, stimulation of 

 the central stump produced good contraction of muscles in ulnar area at 

 15 ctm. S. C. 



(3) Direct stimulation of the muscular branch to flex. carp. ul. and flex, 

 profund. dig. at 15 ctm. S. C. excited contractions of these muscles, which 

 were very clearly seen after the muscles were exposed. 



(4) Stimulation of peripheral ulnar at wrist, at 2 ctm. S. C, excited no 

 movement of the digits and no evidence of pain. 



(5) Stimulation of ulnar in the middle of forearm produced feeble 

 reflexes at 5 ctm. S. C, showing some regeneration of sensory fibres. 



(6) Cutting the nerve with scissors gave distinct contractions, the nerve 

 being cut both above central wound and below peripheral wound. Cutting 

 the muscular branches to flex. carp. ul. and flex, profund. dig. also produced 

 contraction, but no contraction resulted when the nerve was cut at the 

 wrist. 



The nerve was hardened in Miiller's fluid, and stained in anilin blue and 

 safranin. 



Experiment 20. — ]z.n. 24, 1894. 



Brown and white spaniel. Hypodermic injection of | grm. morph. 

 sulph. 



Operation. — The left ulnar was exposed, and a segment 7 ctm. 

 removed ; a piece of equal length taken from a cat's sciatic was implanted, 

 sutured above and below with a single direct catgut suture, and the wound 

 closed. 



Jan. 31, 1894. Wound healed by first intention. 

 Examination. — May 5, 1894 (121 days after operation). 



