68o HUBER, [Vol. XI. 



Experiment 22. — Nov. 25, 1893. 



White bulldog, f grm. morph. sulph. injected. 



Ope7'atio7i. — The right ulnar was exposed and resected to the extent of 

 4 ctm., and an equal segment of cat's sciatic implanted, sutured above and 

 below with a single direct catgut suture, and wound closed in the usual way. 



Dec. 13, 1893. The epidermal wound was still open and lined by gran- 

 ulations. The connective tissue seemed to have healed over the implanted 

 nerve and ends of ulnar stump. 

 Examination. — April 23, 1894 (149 days after operation). 



The dog could use the foot apparently as well as before the operation, 

 and the sensation in the foot seemed normal. 



Tests with induced current as follows : — 



(i) Stimulation of peripheral ulnar a short distance below implanted 

 segment (after cutting and resecting median) at 18 ctm. S. C, gave good 

 contractions of muscles supplied by ulnar, and slight reflexes ; marked 

 reflexes when stimulated at 9 ctm. S. C. Stimulation of peripheral ulnar 

 at 18 ctm. S. C, after severing the central ulnar about 5 ctm. above the 

 central wound, excited marked movements of flexion. 



(2) Stimulation of central ulnar (after separation from center), at 18 

 ctm. S. C, gave good contractions in muscles supplied by the nerve, feeble 

 contractions when stimulated at 24 ctm. S. C. 



(3) Direct stimulation of muscular branch to flex. carp. ul. at 18 ctm. 

 S. C. gave movements of flexion. 



(4) Stimulation of ulnar at wrist at 9 ctm. S. C. called forth movements 

 of flexion in digits. 



(5) Cutting the ulnar above implanted segment, below implanted seg- 

 ment, and cutting the branches to flex. carp. ul. and flex, profund. dig., was 

 followed by marked contraction of the muscles supplied. Cutting the ulnar 

 at the wrist was followed by feeble contraction of digits. 



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

 safranin. 



In experiments 23 and 24 the results were almost identical with those 

 recorded for experiment 22. 



Experiment 23. — Nov. 29, 1893. 



Young mastiff about one year old. § grm. morph. sulph. injected, 

 followed by ether. 



Operation. — The ulnar of right arm was exposed, and a segment 6 ctm. 

 long removed. An equal segment taken from a cat's sciatic was implanted, 

 and sutured above and below with a single direct catgut suture. 



Dec. 4. Greater portion of the wound healed by first intention ; the 

 lower end of the wound was open and lined by granulations. 

 Examination. — May 30, 1894 (182 days after operation). 



Wound healed. Sensation in foot normal, as far as could be determined 

 by pricking the parts. On exposing the ulnar only a very slight enlarge- 

 ment was noticed on the end of the central stump. 



