No. 3.] PERIPHERAL NERVES. 685 



April 23. Foot not so red and swollen, ulcerating surfaces granulating, 

 and the dog seemed to have better control of the foot than he had for the 

 first three months after the operation. 

 Examination. — April 23 (121 days after operation). 



The peripheral end of the central stump ends in a large bulb, which is 

 very sensitive. 



Physiological examination resulted as follows : — 



(i) Stimulating sciatic below the bone tube with strong induction shocks 

 caused no movement and no reflexes. 



(2) Stimulating the sciatic above the bone tube with induction shocks at 

 5 ctm. S. C. produced no contraction of the muscles supplied by the sciatic. 

 Cutting the nerve above the bone tube caused no movement of the muscles. 



(3) Stimulating the external and internal popliteal with strong induction 

 shocks gave no contraction of the foot. 



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

 safranin. 



Experiment 33. — Dec. 20, 1893. 



Large black mongrel. | grm. morph. sulph. injected. 



Operation. — The right ulnar was resected to the extent of 5 ctm., the 

 ends united with the bone tube, and wound closed. 

 Examination. — May 5, 1894 (130 days after operation). 



Healing ulcer on the outer surface of the foot. 



Stimulation of the peripheral ulnar just below the bone tube with induc- 

 tion shocks at 9 ctm. S. C. produced scarcely perceptible reflexes, and no 

 flexion. Reflexes not increased with strong stimulus. Stimulation of the 

 central ulnar above the bone tube at 5 ctm. S. C. excited no contraction in 

 muscles supplied by ulnar. Mechanical stimulation, by cutting the nerve 

 above and below the bone tube, excited no movement. 



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

 safranin. 



Experiment 34. — March 9, 1894. 



Black and brown hound. Hypodermic injection of | grm. morph. sulph., 

 followed by ether. 



Operation. — The left ulnar was resected to the extent of 6 ctm., and the 

 wound closed without suturing the nerve. 



April 19 (forty-one days after resecting the nerve). The ulnar was 

 again exposed. The peripheral end of the stump presented a large 

 and very sensitive bulb. No nerve fibres could be traced beyond 

 this enlargement. The central end of the peripheral ulnar was not 

 enlarged, and proved to be completely degenerated, as shown by its not 

 responding to induction shocks. The ends of the central and peripheral 

 stump were vivified, leaving a space of about 7 ctm. between the resected 

 ends. These were inserted into the ends of a bone tube and sutured. The 

 wound was then closed in the usual manner. 



