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The object of the researches here described was to determine whether there is or is not, within the cord, regeneration of the fibres of the dorsal roots of the spinal nerves following the degeneration caused by injury to the roots between the spinal ganglion and the cord, and also to show the amount of this regeneration, if any should Occur. With this object in view experiments were conducted upon the second cervical nerve in the dog. The selection of this nerve was suggested by the following considerations: In the first place, the posterior root ganglion of the second cervical nerve in the dog lies normally outside the intervertebral foramen, so that experiments upon the roots are much easier and the risk of injuring the cord is much less than it wonld be were it necessary to open the vertebral canal. ]~[oreover, the second cervical nerve in the dog is connected with the sympathetic system, not by a mixed ramus communieans, but by a gray ramus alone; a fact of some importance, as will be shown later. Evidences of regeneration were sought for both by physiological and by histological methods. The present article deals with the physiological methods and the,results obtained by them, while a discussion of the subject from a histological standpoint will appear later. The literature of this subject is not extensive, and most of it dates from a period when the ideas concerning the relations of the nerve fibres and cells were less complete than at the present day. In the very brief summary of this literature that is here presented no especial attempt is made to criticise the older results in the light of newer

REGENERATION OF THE DORSAL ROOT FIBRES OF THE SECOND CERVICAL NERVE WITHIN THE SPINAL CORD