ite) Cincinnati Society of Natural History. 
In the motor ganglion cells in the anterior horn of the 
spinal cord, the neurosome presents quite a different arrange- 
ment from that of spinal ganglion cells. In the former group 
the meshes of the reticulum do not show the honey-comb 
form, but an elongated shape. The cytoplasmic thread car- 
ries a great number of neurosomes, which form straight 
chains. These chains run parallel to the periphery toward 
the dendrites, as well as toward the axis cylinder. Around 
the nucleus, however, these chains have the arrangement 
found in the spinal ganglion cells. 
The Purkinjii cells in cerebellar cortex in the white rat 
show still a different arrangement of neurosomes. In these 
cells the neurosomes accumulate at the base of the main den- 
drites, showing very intricate arrangement. But near the 
entrance of the dendrites the irregular chains rearrange 
themselves, forming a regular line of neurosomic fibrils. The 
remaining part of the cell-body show nearly the same arrange- 
ment as that of the spinal ganglion cells. 
IV.—REMARKS CONCERNING THE STRUCTURE OF THE 
GROUND SUBSTANCE IN NERVE CELLS. 
As has been mentioned already, the ground substance of 
the spinal ganglion cells of the white rat presents very clearly 
the reticular structure. ‘This structure, however, is altered 
by the growth of cell-body; for example, the prolongation of 
the axis cylinder from the cell-body is accompanied by an 
elongation of the primitively polygonal meshes of the reticu- 
lum, thus giving a fibrillar appearance to the ground sub- 
stance. 
The same holds true in the case of the Torpedo. The ap- 
parent fibrils result from alterations in the reticulum, and, 
therefore, should not be compared to those of Bethe’s. Al- 
though, in the case of the Torpedo, the reticulum is hard to 
see, yet it is sometimes clearly demonstrable in thin sections 
properly stained. 
In the spinal ganglion cells of the higher mammalia, except 
in Dogiel’s second type of cells, the cell - body sends off only 
one prolongation, while in the case of Torpedo, the efferent 
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