No. 3.] PERIPHERAL NERVES. 679 



Electrical stimulation with induction shocks after exposing the nerve in 

 the arm gave the following results : — 



(i) Stimulation of peripheral ulnar just below implanted segment at 

 I2ctm. S. C. gave good contraction of the muscles supplied by the ulnar. 

 There was much pain as shown by reflex movements. The median and 

 musculo-spiral were cut and resected before the tests were made. 



(2) Stimulation of central ulnar just above implanted segment at 

 12 ctm. S. C, and after severing the central ulnar about 4 ctm. above the 

 central wound, gave marked contraction of the flexor muscles supplied by 

 the ulnar nerve. 



(3) Stimulation of muscular branch to flex. carp. ul. at 12 ctm. S. C. 

 gave contraction of this muscle. 



(4) No contraction resulted when the ulnar was stimulated at the wrist 

 at 5 ctm. S. C. The nerve was not stimulated at this point before the 

 central ulnar was cut. 



(5) Mechanical stimulation by cutting the nerve with scissors above the 

 implanted segment, below the implanted segment, and cutting of muscular 

 branches to flex. carp. ul. and flex, profund. dig., called forth marked con- 

 tractions in muscles supplied by the ulnar and its branches. There was no 

 movement of the digits when the ulnar was cut at the wrist. 



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

 safranin. 



Experiment 21. — Dec. 20, 1893. 



Large black mongrel. | grm. morph. sulph. injected, followed by ether. 



Operation. — The right median nerve was exposed and resected to the 

 extent of 5 ctm., and 5 ctm. of a cat's sciatic implanted, and sutured above 

 and below with a single direct catgut suture, and the wound closed. The 

 wound healed by first intention. 

 Examination. — May 5, 1894 (136 days after operation). 



Stimulation with induction current gave following results : — 



(i) Stimulation of median below implanted segment at 15 ctm. S. C. 

 gave contraction in muscles of forearm supplied by median, and much pain 

 as shown by well-developed reflexes. Equally marked flexion resulted upon 

 stimulating the peripheral median after severing the central median 4 ctm. 

 above central wound. 



(2) Stimulating the central median just above the implanted segment at 

 15 ctm. S. C. produced well-developed movement of flexion. 



(3) Direct stimulation at 12 ctm. S. C. of several of the small muscular 

 branches given off just below the elbow, gave contraction in muscles supplied 

 by them. 



(4) Mechanical stimulation by cutting the nerve with scissors produced 

 very marked contractions. 



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

 safranin. 



