i 
122 Wıruıam A. Hinton, 
are very small, often with very little cytoplasm surrounding the 
nucleus, and exhibit a fine process extending from one end of the 
cell in towards the central portion of the ganglion and one from 
the other end extending out towards the periphery. Whether these 
small cells are functional nerve cells or not, I do not know. At 
least one of them was found closely applied to the surface of a 
process from another larger cell (Figs. G, J). 
In the more central portions of the ganglion no definite arrange- 
ment of neurons was evident. They were irregularly scattered or 
erouped, sometimes they were very abundant, at other times only a 
few cells were found. None of them were as large as the largest 
© 
Fig. H. Fig. J. 
Fig. H. Four large cells from the peripheral region of the ganglion of Tunica 
nigra. 450:1 
Fig. J. Cells from the central region of the ganglion of Tunica nigra. 450:1. 
found at the periphery of the nerve center, and there were many 
nuclei the processes of whose cells, if they had any, were not found. 
This was similar to the condition of things found at the periphery 
of the ganglion. The cells of the central area, because of their 
isolation, could be studied in some ways better than the others, 
because all sides of them could be seen. They were found to have 
a number of processes. Some of the processes from the cells seemed 
to be confined to the central area, probably for associations in this 
region, others ran to the edges of the deeper masses at various 
