636 HUBER. [Vol. XI. 



the implanted segment was found to be united to the resected 

 ends of the nerve, but the transplanted portion possessed no 

 conductivity. Tillmanns, in referring to Johnson's experiments, 

 calls attention to the short interval intervening between the 

 operation and the date of the examinations, and correctly 

 assumes that regeneration might have taken place if a longer 

 time had elapsed. 



In a series of fifteen experiments recorded by Assaky, deal- 

 ing with the operative treatment of " nerve defects," trans- 

 plantation of a nerve was made in four. 



(Exp. 3.) A rabbit's sciatic was resected 3 ctm.; a segment 3^ ctm. 

 long, taken from the sciatic of a turkey, was implanted, and sutured above 

 and below with fine catgut. The animal was examined thirty-five days 

 after operation. On pinching the nerve above the implanted segment slight 

 flexion of the foot was observed. The same result when stimulated with 

 the induction coil. On histological examination a few nerve fibres were 

 found in the implanted and peripheral nerve. 



(Exp. 12.) The operation was the same as above. The animal was 

 killed sixty-eight days after operation, and the abdominal aorta injected 

 with gelatine and Berlin blue. The operated leg was seized with clonic con- 

 vulsions. However, these were not as vigorous as on the well side. No 

 new-formed fibres were found in the implanted segment. 



(Exp. 14.) The median of a dog was resected 3>^ ctm., and a piece of 

 equal length, taken from a rabbit's sciatic, was implanted. The dog was 

 killed thirty-eight days after operation. A cord of fusiform shape was 

 found to unite central and peripheral stump of the median. On cutting 

 into this it was found to contain a " pus-like " substance. No histological 

 examination was made. 



(Exp. 15.) Implantation of a segment from rabbit's sciatic between the 

 resected ends of a dog's sciatic. The operation was a failure. 



The rapid return of function, obtained by Assaky in the -first 

 of the four experiments just quoted, would seem to show that 

 regeneration occurs more speedily in rabbits than in dogs, the 

 animals used by the author in his experiments. 



Biinger gives the result of one experiment in which he 

 exsected i ctm. from the right sciatic of a dog, and trans- 

 planted a segment from the other sciatic. Fifty days after the 

 operation the nerve was examined ; at this time he was not 

 able to state what had become of the implanted segment, as in 

 its place were found newly formed nerve fibres. He is, how- 



