682 HUBER. [Vol. XI. 



marked evidence of pain as shown by reflexes ; this after the median had 

 been cut and resected. 



(2) Stimulation of the ulnar above the implanted segment, after severing 

 the ulnar from the center, gave marked contractions at 12 ctm. S. C. 



(3) Stimulating the ulnar in the middle of the forearm gave feeble 

 reflexes at 8 ctm. S. C. 



(4) Stimulating at wrist caused no movements and no reflexes. 

 Regeneration seems to have taken place through the implanted segment 



to a little below the middle of the forearm. 



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

 safranin. 



{b) Tubular Suture Bone Tube Implantation. 



The experiments of others, notably those of Vanlair, had caused me to 

 look with favor on the use of the bone tube in operations for remedying 



-'•*^ 



Fig. I. 



nerve defects, but the results here recorded do not fulfill this anticipation. 

 The bone tubes used were prepared in the following manner : The ulnars 

 of chickens and turkeys were decalcified, after cutting off the ends, in one 

 per cent hydrochloric acid, then thoroughly washed in flowing water, placed 

 into ether for a few hours, and finally transferred to a five per cent solution 

 of carbolic acid, where they remained until needed. Just before using, the 

 bone tubes were boiled for fifteen minutes in alcohol, and then placed in 

 sterilized distilled water, from which they were implanted. After resecting 

 the nerve to the desired extent, the central and peripheral ends of the 

 resected nerve were inserted into the ends of the bone tube for a distance 

 of about I ctm., and held in place by a single suture above and below, 

 passed through the sides of the tube, and at the same time through the 

 ends of the nerve inserted within its lumen. The mode of procedure is 



