Hatai, Spinal Ganglion Cells of Rat. 489 



ganglion cells are classified into two groups according to their 

 structural characters: {a) Pycnomorphic cells, those cells which 

 appear dark owing to a stronger affinity to the staining reagents; 

 and the cell-outline of the same is usually irregular. Such cells are 

 usually small in size, {b) A pycnomorphic cells, those spherical 

 or oblong cells which stain lightly and have cell-outlines which are 

 regular. Such cells range from small to large in size. These two 

 groups however grade into one another 



