PLATE 7 



lOXPl.ANATIOX OF FIGURES 



27 Fiber of the nervus ischiadicus of fowl No. 38. a, new axis cylinder 

 with a branch, b, growing down into a long globule of degenerated myelin, /«; 

 a', remnant of old axis cylinder; n, nucleus of neurilemma sheath; r, node of 

 Ranvier. Phosphomolybdic acid hematoxylin. X 500. (See also figs. 28 and 

 29.) 



28 and 29 Photomicrographs at different focal levels of the same prepara- 

 tion shown in figure 27. 



30 New axis cylinder, a, with end bulb, b, among a grouji of nucleated 

 bands (embryonic nerve fibers or non-medullated fibers?), n, nuclei. Phospho- 

 molybdic acid hematoxylin. X 555. 



108 



