— I04 — 
fibres are, in some sections, seen issuing from the sheath of the 
ganghon cell. Similar fibres can also be traced into the prosesses 
(fig. 27, b) where they have a longitudinal course (fig. 30, sf, sf). Some- 
times, in the cells, they are so closely situated that it looks as if they 
almost formed a sheath (cmfr. fig. 28) surrounding the process-contents 
for some distance into the cell-protoplasm, where they gradually 
disappear and obtain the same appearance as the reticulated spongio- 
plasm, which spongioplasm often apparently gives, even the smaller 
bundles of primitive tubes in the protoplasm, a kind of relatively 
firmer surrounding layer resembling a thin membrane, which layer 
is generally more deeply stained by hæmatoxylin than the surround- 
ing protoplasm (vide fig. 25, 27, 28, v and 2g,v,v'). 
Sometimes the primitive tubes are united to a few and very 
large masses situated peripherically in the cellJ) Fig. 38, A represents 
a section through such a cell; v and are the transsected masses 
of primitive tubes. In fig. 39, which represents a more laterally 
running section through the same cell, it is seen what an extensive 
distribution these masses can have in the peripheral parts of the cell, 
the section passes almost exclusively through such a mass of primi- 
tive tubes. If we examine these light areas under high powers of 
the microscope, we see that they exhibit the same reticulation which 
we know from transversally transsected nerve-tubes and nervous 
processes, and which reticulation evidently arises from the transsec- 
tion of primitive tubes. 
In many ganglion cells we find similar peripheral masses, which 
are not, however, so distinctly defined as those just described. We 
can, indeed, find every stage of transition, from cells such as those 
illustrated in fig. 38, A to cells with a diftusive, uniform extension 
of a lightly stained mass in their whole peripheral layers, such cells 
are, for instance, illustrated in fig. 38, B and fig. 37. These peri- 
pheral layers, of lightly stained mass, can have a more or less di- 
stinct demarcation from the mesial, deeply stained, part of the pro- 
toplasm, or they can also have a quite successive transition into it. 
In the protoplasm of most ganglion cells we will, indeed, find a 
1) In macerated preparations these masses are often seen, having the ap- 
pearance of vacuoli situated especially in the peripheral layers of the protoplasm 
of the cells and along their margins. For a long time I believed this appearance 
of the cells to be of artificial nature, produced by the macerating agents. It was 
first on examination of successfuUy prepared sections that I learnt their real nature. 
In macerated cells, the striated process-contents could sometimes be traced into the 
cell-protoplasm, it having, for some distance, an undivided course (vide fig. 23, A). 
