PLATE 5 



EXPLANATION OF FIGURES 



17 Fiber from the nervus ischiadicus of fowl No. 38 — 108 days in regen- 

 eration — a, new axis cylinder; a', segment of old axis cylinder enclosed within 

 a large globule of degenerated myelin, m; n, node of Ranvier. Mallory's phos- 

 phomolybdic acid hematoxylin. X 500. 



18, 19 and 20 Photomicrographs of sections of the nervus ischiadicus show- 

 ing new axis cylinders, a, and fragments of the old, a', in globules of degen- 

 erated myelin, ?n. Figures 18 and 19 from fowl No. 38. Figure 20 from fowl 

 No. 54, 171 days in regeneration. Phosphomolybdic acid hematoxylin. Zeiss 

 4 X 2 mm. oil immersion 



104 



