482 journal of Comparative Neurology and Psychology. 



together by fine processes. The nucleus is clear and possesses 

 a nucleolus. These cells are most numerous. 



3. Small, dark cells with numerous small stainable masses 

 lymg in the region of the nucleus. The ground substance becomes 

 diffusely stained. The nucleus also stains diffusely and con- 

 tains two or more nucleoli. These cells rank third in point of 

 number. 



4. Small or medium sized clear cells with large stainable 

 masses which are present in small numbers and connected with 

 each other by processes. The nucleus frequently possesses more 

 than one nucleolus. These cells are not numerous. 



5. Large clear cells with long drawn out masses which are 

 continuous with one another and which arrange themselves in 

 concentric lines around the nucleus. These last cells present a 

 laminated appearance like the cross section of an onion. These 

 cells are least numerous. 



Lenhossck ('96) in the human spinal ganglion distinguishes 

 three varieties. 



1. The first variety consists of cells with a light staining ground 

 substance only. These, which are the largest cells, have a pale 

 ground substance and less numerous, loosely arranged stainable 

 masses, which are most dense around the nucleus. 



2. To the second variety belongs coarsely granular cells 

 (grobscholligen Zellen), the appearance of which depends on the 

 arrangement of the stainable substance, and most of the cells in 

 the ganglion belong to this variety. These cells are of medium 

 size, but sometimes small and rarely very large. 



3. The third variety contains small cells which have a peculiar 

 internal structure. These cells stain darkly because of the den- 

 sity of the ground substance. 



Cox ('96) distinguishes in the spinal ganglion of the rabbit 

 two main varieties. 



1. One variety contains larger or smaller irregular masses of 

 stainable substance, which do not show a distinct concentric 

 arrangement. The cells of this variety may be either large or 

 small. 



2. The other variety contains large, irregular masses of stain- 

 able substance arranged concentrically. 



It will be clearly seen from the description given by these authors 

 that there exist some structural characters common to both large 



