690 HUBER. [Vol. XL 



Experiments 44 and 4S. — June 2, 1894. 



White and brown mongrel. | grm. morph. sulph. 



Operation. — No. 44, right ulnar ; 45, left ulnar. 



After ten days there was degeneration of peripheral ulnar. 



Experiment 46. — April 20, 1 894. 



Large yellow and black mongrel. ^ grni. morph. sulph., followed by 

 ether. 



Operation. — The right ulnar was exposed, and 6 ctm. cut out. A flap 

 was made from the central stump and sutured to the peripheral ulnar, and 

 wound closed. 

 Examination. — June 23, 1894 (64 days later). 



Wound completely healed, and the dog did not seem to suffer any 

 inconvenience in the use of the extremity. On exposing the ulnar the 

 peripheral end of the central stump was slightly enlarged. 



(i) Electrical stimulation of peripheral ulnar at 5 ctm. S. C, just below 

 its junction with the flap, excited no contraction and no reflexes. 



(2) Stimulating in the region of the flap, after freeing it by dissection, 

 caused pain, as shown by reflex movements, but no contraction. 



(3) Stimulating the central ulnar with a strong current gave no contrac- 

 tions. 



Conclusion. — There was a down-growth of sensory fibres for a short 

 distance below the end of the central stump, but not into the peripheral 

 ulnar. 



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

 safranin. 



Experijnent 47. — March 6, 1 894. 



Full-grown greyhound. | grm. morph. sulph. injected, followed by ether. 



Operation. — A segment 5 ctm. long was removed from the right ulnar, 

 and a nerve flap made from the central stump was turned down and stitched 

 to the peripheral ulnar. Wound closed. 

 Examination. — July 31, 1894 (147 days after). 



Electrical stimulation of the exposed ulnar, below the peripheral flap, 

 with a strong induced current excited no contraction of muscles in ulnar 

 area, and gave no evidence of pain as would be shown by reflexes. 



Cutting the ulnar at various points gave the same negative results. The 

 physiological examination showed no regeneration. 



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

 safranin. 



Experiment 48. — March 6, 1894. 



Full-grown greyhound. § grm. morph. sulph. injected, followed by ether. 



Operation. — Removed 5 ctm. of the left ulnar. The free ends of two 



nerve flaps, one made from the central stump about 3 ctm. long, the other 



