Hata, Spznal Ganglion Cells of the Rat. II 
substance in the powder form is also quite abundant in these cells. 
This contributes to the dark appearance of the cell-body. These 
cells just described are generaily larger than those mentioned 
in the first paragraph. In the former case, the cell-body looks 
structureless. But the writer’s observation shows, this is not 
homogeneous or structureless in the strict sense of the word as 
is indicated by the statement that this cells stain somewhat 
darkly because of density of the ground substance. A well 
preserved and satisfactorily stained preparation shows very 
clearly that the cytoplasm is filled up very densely with a pecu- 
liar substance named by HEtp’ the ‘‘neurosomes’’ which are 
stainable only by acid dyes. There are so many of these neu- 
rosomes that one can hardly distinguish one individual from an- 
other and the cytoplasm appears a continuous reddish mass. 
The small cells (in Series C) are in the same condition, having 
great numbers of neurosomes. From this is quite clear that the 
chromophilic cells, as named by Nissz, are peculiar in the 
arrangement of the neurosomes. 
Another interesting point concerning the small cells is that 
in every case the cell-bodies skrink a little more than those of 
larger cells. My own mixture for preservation (6) gives the 
cells in a nearly normal size and no spaces appear around the 
cell-body in the case of the larger cells. But around the small 
cells such spaces are to be seen. This skrinkage has been in- 
terpreted as a pathological change but one can hardly believe 
that there are so many pathological cells in the normal spinal 
ganglion. It should be remembered that the spinal ganglion 
contains a greater number of the small cells than of those larger 
in size. We will explain later why the small cells tend to 
shrink. 
Let us first compare these small and large cells as to the 
arrangement of the masses of stainable substance in them. 
These masses in the larger cells are arranged in a more complex 
1 HeLp, H.—Beitrage zur Structur der Nervenzellen und ihrer Forts&tze. 
Erste Abhandlung. Arch. fiir Anatomie und Entwicklungsg., Anat. Abth. ’95 
