— io8 — 
of thicker or thinner bundles, sometimes these even grow to con- 
siderable masses, generally situated peripherically in the cells 
(cmfr. fig. 30). 
Jf we try to explain the connection and relation of these con- 
stituents of the protoplasm to each other, we have indeed no easy 
task. And it is, especially of this, I could wish to have obtained 
more light. 
That a principal part of the protoplasm of the ganglion cells 
consists of primitive tubes, I think must be evident from what is 
already described; that a great number of the small meshes, seen 
in sections of the protoplasm of the cells (in the peripheral part as 
well as in the mesial one) are transsected primitive tubes is, I think, 
very probable. 
There must, however, in the protoplasm of the ganglion cells 
be something also present, besides primitive tubes, because the pro- 
toplasm is stained by hæmatoxylin and other agents in a manner 
very different from the contents of the nerve-tubes, which exclusively 
consists of primitive tubes. By hæmatoxylin, the protoplasm is 
generally stained very deeply, except those bundles or masses of 
primitive tubes which get a similar staining as the contents of the 
nerve-tubes. This deep staining may, certainly, to some extent be 
explained by a rich occurrence of spongioplasm (cmfr. the spongio- 
plasmic reticulation described above p. loi). I feel, however, dis- 
posed to think, that besides this spongioplasm another (myeloid.^) 
substance occurs, perhaps in connection with it. Spongioplasm with 
this fattish substance ^) is, I suppose, situated in thicker or thinner 
layers between the primitive tubes running through the protoplasm, 
and separates each of them more widely than is the case in the 
nerve-tubes. Within the bundles or masses of primitive tubes, oc- 
curring in large ganglion cells, this substance is not present, nor is 
there apparently more spongioplasm than is generally present in the 
nerve-tubes or the nervous processes. 
The striicture of the nervous processes and their 
sheaths, in their coitrse oiitside the ganglion cells. — The 
contents of the nervous processes is, as already mentioned, composed 
of primitive tubes, in the same way as the contents of the nerve- 
tubes. In its staining it is dififerentiated from the protoplasm of the 
^) That it is a fattish (myeloid?) substance is, I think, probable from the 
dark or brownish staining of the cell-protoplasm by osmic acid. This is, however, 
also the case with the common spongioplasm. 
