VoLuME XI. 1900. NUMBER 1. 
THE 
JournaAL oF Comparative Neurovoecy. 
THE’ FINER~ STRUCTURE OF THE SPINAL GAN- 
GLION CELLS IN THE WHITE. RAT. 
By SHINKIsHI Hatat. 
(From the Neurological Laboratory of the University of Chicago.) 
With Plate I. 
The spinal ganglion of the white rat contains two very 
different kinds of ganglion cells. One is larger in size and less 
compact in the structure of the cytoplasm than the other (Figs. 
I, 2, 3) and also stains lightly with eosin and erythrosin. This 
kind has been the most studied by previous investigators and 
its structure is comparatively well known. ‘The second kind is 
very compact in the structure of the cytoplasm (Figs. 4, 5), stains 
deeply and is not so well known. The two kinds of ganglion 
cells have been found in all vertebrates in which the spinal gan- 
glia have been carefully studied. 
The present paper deals with the structure and significance 
of the small spinal ganglion cells. 
The observations recorded may conveniently be presented 
in the following order: 
i Fechnique: 
II. Measurements of the cells in the spinal ganglion. 
III. Internal structure of spinal ganglion célls. 
IV. Review of growth changes in the spinal ganglion. 
V. Summary. 
