STUDY OF POLYNEURITIS GALLINARUM. 461 



Plate IX. 



Fig. 17. Longitudinal section of the sciatic nerve of a fowl fed for 

 eighteen days on polished rice. In fiber b, the stainable ma- 

 terial has collected into larger masses which in places coalesce 

 into globules, b. Mitochondria (iron-haeniatoxylin) method. 

 Zeiss 4X4 mm. apcr. 

 18. Longitudinal section of the sciatic nerve of fowl 14, showing 

 pronounced symptoms of peripheral neuritis and marked de- 

 generation in the sciatic. Globules are more discreet than 

 in fig. 17, and the stainable material is for the most part at 

 the contoured periphery of the globules, a. The other fibers 

 show a diffusion of the stainable material. Mitochondria 

 (iron-haematoxylin) method. Zeiss 4x4 mm. apcr. 



Plate X. 



Fig. 19. Nerve cell from spinal cord of normal fowl. Nissl stain. Zeiss 

 4X4 mm. 



20. Same. Giemsa blood stain. 



21. Nerve cell from ventrolateral group of the lumbosacral cord of 



a fowl (No. 48, twenty-four days on polished rice) with 

 marked paralysis of the legs and marked degeneration in the 

 sciatic. The tigroid bodies are no longer apparent. The stain- 

 able material which appears granular has collected at one 

 side of the cell around the implantation cone (a) of the axis 

 cylinder. Giemsa blood stain. Zeiss 4 X D. 



22. Nerve cell from same preparation as fig. 21, same group. Note 



bulging of cell at a where the stainable material is collected 

 in one mass. The nucleus, n, shows degenerative changes. 

 Zeiss 4 X i/jo oil immersion. Camera lucida, reduced i. 



Plate XI. 



Fig. 24. Teased preparation (Marchi method) of the sciatic nerve of 

 fowl 16 which was fed for thirty-five days on polished rice 

 without showing any symptoms of neuritis. At a, a fiber is 

 seen showing advanced degeneration. Other fibers show less 

 marked change. Zeiss 4X4 mm. 



