No. 3.] PERIPHERAL NERVES. 675 



In experiments 6 to 13, inclusive, there was found complete loss of irrita- 

 bility of the peripheral stump of the divided nerve, as shown by mechanical 

 and electrical stimulation. 



Experi7nent 14.. — Oct. 23, 1893. 



Yellow and white mongrel, narcotized by means of f grm. morph. sulph. 



Operation. — The right ulnar and median were exposed, and resected to 

 the extent of 4 ctm., and a segment of equal length removed from a cat's 

 sciatic was implanted, stitched above to ulnar and median by a single direct 

 catgut suture, and below to the peripheral ulnar. The subcutaneous tissue 

 was sutured over the nerve by means of five buried catgut sutures, and the 

 epidermis closed by five silk sutures. 



Oct. 27. Several silk sutures had given way, and the wound was granu- 

 lating. 



Nov. 14. Wound almost entirely healed. The hair was falling out on 

 the inner side of forearm, and a small ulcer had formed on radial side of the 

 wrist. The sensation in the foot seemed quite normal, and the dog used the 

 foot in walking. 

 Examitiation. — Nov. 14, 1893 (twenty-one days after operation). 



The implanted nerve and ends of the nerve stump were surrounded by 

 well-formed connective tissue. 



Electrical stimulation with induction shocks at 5 ctm. S. C, below 

 implanted segment, showed no contraction, and no evidence of pain. 

 Stimulation above the implanted segment at 5 ctm. S. C, after severing the 

 nerve 5 ctm. above central wound, showed no contraction. 



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

 safranin. 



Experwtent /j. — Oct. 23, 1893. 



This experiment was performed on the ulnar of left side of dog used for 

 experiment 14. 



The operation, duration of experiment, and the results obtained were the 

 same as in the preceding experiment. 



The nerve was hardened and stained as in experiment 14. 



Experiment 16. — April 21, 1894. 



Small black bulldog about one year old. f grm. morph. sulph. was 

 injected. 



Operation. — The ulnar and median were resected to the extent of 7 ctm., 

 and 7 ctm. of a cat's sciatic implanted and sutured, above to ulnar and 

 median with single direct catgut sutures, below to peripheral ulnar with 

 same sutures. Wound closed. 



Wound healed by first intention. At no time did the dog seem to have 

 any loss of sensation or motion in the operated leg or foot. 

 Examination. — May 28, 1894 (thirty-nine days after operation). 



