4:8 NERVOUS SYSTEM.- 



regard to the intimate structure of the substance of the nerve- 

 cells, their nuclei and nucleoli, and the points involved have 

 a certain amount of physiological interest. In the first place, 

 the transverse striae in the axis-cylinder treated with nitrate 

 of silver, noted by Frommann and confirmed by Grandly and 

 others, have been observed by Grandry in the substance of 

 the nerve-cells. 1 While this fact, perhaps, shows that the 



FIG. 7. 



Nerve-cell from the ferruginous substance which forms the floor of the rhomboidal sinus in man 

 Magnified 850 diameters. (K6LLIKEB, Handbuch der Cfewefjelekre, Leipzig, Ib67, S. 291.) 



substance contained in the cells and their prolongations is 

 the same as the substance of the axis-cylinder, as we stated 

 with regard to the axis-cylinder, it is possible that the mark- 



1 See page 22. 



