No. 3] PERIPHERAL NERVES. 68 1 



Electrical examination with induced shocks gave the following results : — 

 (i) Stimulation of peripheral ulnar at lo ctm. S. C, just below peripheral 

 wound, caused much pain, as shown by well-developed reflexes, and called 

 forth muscular contractions in the muscles supplied by the ulnar. Similar 

 contractions resulted when stimulated after the central ulnar was cut, and 

 after the median and musculo- spiral were resected. 



(2) Stimulation of peripheral ulnar at wrist at 10 ctm. S. C. (a distance 



7 inches below peripheral wound) caused movements of toes and quite well 

 developed reflexes, showing regeneration of at least some of the sensory 

 and motor fibres as far down as the foot. 



(3) Stimulation of central ulnar at 15 ctm. S. C. produced movements 

 of flexion. 



(4) Direct stimulation of the muscular branches to flex. carp. ul. and 

 flex, profund. dig. at 10 ctm. S. C. produced contraction in these muscles. 



(5) Mechanical stimulation resulting from cutting the nerve with scissors 

 excited strong muscular contractions, the nerve being cut above and below 

 implanted segment, at the muscular branches, and at the wrist. 



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

 safranin. 



Experiment 26. — March 9, 1894 (secondary implantation). 



Young black and brown hound. | grm. morph. sulph., then ether. 



Operation. — Six ctm. of the right ulnar was removed, and wound 

 closed. 



March 14. Wound healed. 



April 19 (forty-one days after this operation). The ulnar was again 

 exposed. The end of the central stump terminated in a large bulb which 

 was imbedded in fibrous tissue. No nerve fibres were seen to extend below 

 the bulb. The central end of the peripheral ulnar was not enlarged. 



Electrical examination : — 



The central bulb was very sensitive, as shown by the marked reflexes 

 when only very weak stimuli were used. The peripheral ulnar was com- 

 pletely degenerated. The end of the central stump was resected to a line 

 just above the bulb, and the peripheral ulnar vivified. The space between 

 the two ulnar stumps amounted to about 7 ctm. A piece of equal length 

 was taken from a cat's sciatic and implanted, and was sutured above and 

 below to the ulnar stump with a single direct catgut suture. The connective 

 tissue was united over the nerve with five buried sutures, and the skin 

 with a continuous silk suture. Wound healed by first intention. 



Sept. 21, 1894 (155 days after implantation) the dog was examined. 

 Sensation in the foot was not impaired. On exposing the ulnar, a small 

 bulb was seen at the end of central ulnar ; this was not sensitive. 



Electrical examination : — 



(i) Stimulating the peripheral ulnar below the implanted segment at 



8 ctm. S. C. gave good contractions of muscles supplied by this nerve, and 



