No. 3] PERIPHERAL NERVES. 677 



(2) Stimulating the central ulnar at iSctm. S. C. above implanted 

 segment, after severing from the center, gave marked contraction in the 

 muscles supplied by the ulnar. 



(3) Direct stimulation of muscular branch to flex. carp. ul. gave good 

 contractions at 15 ctm. S. C. 



(4) Mechanical stimulation, such as striking the nerve with a small 

 rubber hammer at a point one inch below the peripheral wound, gave 

 flexion of flex. carp. ul. 



(5) Contraction was produced in the muscle supphed by ulnar when the 

 nerve was cut with scissors above the implanted segment, and cutting the 

 muscular branch below the peripheral wound caused flex. carp. ul. to con- 

 tract. Unfortunately the record does not state whether the nerve was 

 stimulated at the wrist or not. 



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

 safranin. 



Experiment 18. — Aug. 18, 1893. 



Small white Spitz. Hypodermic injection of § grm. morph. sulph. fol- 

 lowed by ether. 



Operation. — The ulnar of the right side was resected to the extent of 

 8 ctm., and 8 ctm. of a cat's sciatic implanted, and wound closed. 



Aug. 30. Wound healed by first intention. 

 Examination. — Dec. 12, 1893 (120 days after operation). 



The dog was prepared for an operation on the posterior extremity. 

 I grm. morph. sulph. was given ; while sterilizing the instruments the dog 

 died from the effects of the morphia. As the apparatus for testing the 

 nerves was not at hand, and the dog was dead some time before the dissec- 

 tion could be made, no reliance can be placed upon the results. 



Exposing the nerves showed the peripheral end of the central ulnar to 

 be bulbous, and the peripheral ulnar of normal appearance. Spanning 

 between the two stumps of the ulnar could be seen four or five very fine 

 glistening threads of the appearance of nerve fibres. Stimulation of the 

 peripheral ulnar (thirty-five minutes after the death of the dog) excited no 

 movement and no reflexes. 



I was not able to tell whether the apparent failure in the experiment was 

 due to the time intervening between the death of the animal and the physi- 

 ological tests or not. The experiment is recorded because it shows the only 

 incident where, after a period of more than 1 20 days after the implantation, 

 regeneration through the implanted segment had not taken place. The 

 histological examination of the nerve involved in this experiment, showed 

 four well-formed nerve bundles in the upper part of the implanted segment, 

 but no trace of these could be seen in the lower portion. 



Experiment ig. — Jan. 23, 1894. 



Brown mongrel. | grm. morph. sulph. injected. 



