Strong, Nerve Fiber and Cell Body. 401 



The only structures, besides nucleus and nucleolus, to be made 

 out in cell body, dendrites, and axone, are the bodies of Nissl 

 when Delafield's haematoxylin was used. The rest of the 

 cytoplasm of the cell body and dendrites and also the axone at 

 times, showed an approach in places to a fibrillar structure; but 

 usually a nearly uniform color with a slight mottling and a 

 slightly alveolar appearance. There appeared no structural 

 differences, consequently, between the cone, the narrow part, or 

 neck and the medullated or axis cylinder part of the axone. 



Owing probably to the fact, above mentioned, that the method 

 is incapable of demonstrating very fine processes, the axones of 

 the smaller cells were not available for study. It is to be still more 

 regretted that it was not capable of yielding pictures showing the 

 termination of the distal end of the medullated fibers. In the 

 preparations, especially those stained with Delafield's haema- 

 toxylin, the gray matter is filled with fine blue fibers, finer than 

 those exhibited in corresponding Weigert-Pal preparations, but 

 about equal to the latter in number. These fibers are apparently 

 the axis cylinders of the medullated portions of the fibers in the 

 gray. 



All the accompanying figures (Plate XIX) are reproductions of 

 photographs. 



Columbia University, 

 September, 1906, 



