No. 3.] PERIPHERAL NERVES. 673 



emanating from a Du Bois Reymond instrument, in which tne 

 distance between the primary and secondary coils is ten centi- 

 meters, would not, of necessity, be the same at different times 

 even though the same apparatus were used. The distance 

 separating the primary and secondary coils is expressed by the 

 symbol x ctm. S. C. 



In describing the operations here recorded, the following 

 terms have been made use of to designate the different portions 

 of the nerve operated upon, and its relation to the substance 

 implanted : the central portion of the resected nerve has been 

 called the central stmnp ; the peripheral portion, the peripheral 

 stiivtp ; the junction of the central end of the implanted portion 

 and the central stump, the central wound ; and the junction of 

 the peripheral end of the implanted substance and the periph- 

 eral stump, the peripheral zvo?md. 



The order of the operations given in the table on pp. 66^-72, 

 some of which are more fully described in the following pages, is 

 not chronological. It seemed to the author more logical to base 

 it upon the time intervening between the operation and the 

 examination. In doing this it was found necessary to rearrange 

 the notation of the experiments. Often two experiments 

 were made on one dog, the right and left sides being used in 

 succession. In all, thirty dogs were operated upon. 



Record of Operations and Physiological Examinations. 



This record gives a full account of only a part of the operations made. 

 As a detailed description of all the experiments would involve some repeti- 

 tion, only those of interest physiologically have been selected. For the 

 remaining experiments the reader is referred to the preceding tabular 

 synopsis. 



{a) Nerve Implantation. 



Experiment i. — Dec. 9, 1893. 



Full-grown hound. Hypodermic injection of f grm. morph. sulph., 

 followed by ether. 



Operation. — The right ulnar nerve was exposed for a distance of about 

 8 ctm., and exsected to the extent of 6 ctm. A segment of equal length 

 was removed from the left sciatic of a cat, and placed between the 

 cut stumps of the ulnar. The implanted segment was retained in place by 



