676 HUBER. [Vol. XI. 



Wound completely healed. On exposing the nerves the central stump of 

 the ulnar and median was found to terminate in a large bulb, from which a 

 cord, much smaller in cross-section than the central nerve stump, could be 

 traced to the peripheral ulnar. The central bulb, the implanted portion, 

 and the central end of the peripheral stump of ulnar were firmly imbedded 

 in fibrous tissue. 



Electrical stimulation of the peripheral ulnar with induction shocks at 



5 ctm. S. C. (after all the other nerves in the arm above the elbow had been 

 cut) showed no contraction of the muscles in the forearm. The presence 

 of feeble reflexes led to the inference that there was some return of sensi- 

 bility in the peripheral ulnar just below the peripheral wound. Stimulation 

 of the ulnar above the implanted segment after the ulnar had been severed 

 from the center showed no contraction at 5 ctm. S. C. 



Cutting the ulnar above and below the implanted segment produced no 

 contraction. 



The nerve was hardened and stained as in experiment 14. 



Experiment ly. — Oct. 20, 1893. 



White and brown mongrel, f grm. morph. sulph was injected, followed 

 by ether. 



Operation. — The right ulnar and median were resected to the extent of 

 8 ctm., and a segment of equal length removed from a cat's sciatic was im- 

 planted, and sutured above by a single direct catgut suture to the ulnar and 

 median, and below to the peripheral ulnar. The wound was closed in the 

 usual way. 



Oct. 27. Wound closed ; healing by first intention. 



Dec. 17. Wound entirely healed; the dog seemed to use the foot as 

 before the operation. 



Jan. I. No ulcers on the foot. 

 Examination. — Feb. 17, 1894 (117 days after implantation). 



The sensation in the foot as tested by pricking with a needle seemed 

 normal. 



On exposing the nerve, a slight enlargement was seen at the lower end 

 of the stump, and a narrow band, showing here and there faint longitudinal 

 striation, could be traced from the central bulb to just above the central 

 end of the peripheral ulnar, where it was lost in connective tissue. 



Physiological tests: — 



(i) Stimulation with induction shocks at 13 ctm. S. C, of the peripheral 

 ulnar just below the peripheral wound, gave movements of flexion in the 

 muscles supplied by the ulnar. This was especially plainly seen in the flexor 

 carpi ulnaris. There was also evidence of pain as shown by reflex move- 

 ments. Stimulation at the same place, after cutting the central ulnar stump 



6 ctm. above the central wound and after cutting median and musculo-spiral 

 nerves and resecting them as far as possible, gave similar results except, of 

 •course, no signs of pain. 



