128 THE PHYSIOLOGY OF MUSCLE AND NERVE. 



interval of time. An explanation of this variation in the re- 

 action of the nerve cells and their disconnected central stumps 

 cannot yet be given. On the peripheral side of the section, as 

 stated above, the degenerative changes are complete and affect 

 all of the fibers.* 



*Nissl, "Allgemeine Zeitschrift f. Psychiatric," 48, 197, 1892. Also 

 Bethe, loc. tit., and Ranson, " Retrograde Degeneration in the Spinal Nerves," 

 The Journal of Comparative Neurology and Psychology, 1906, xvi, 265. 



