— 105 — 
tendency to stain most deeply in their mesial part, whilst the 
peripheral layers are generally very light (cmfr. fig.s 24, 26, 27, 37, 
38 B, 40). The reason is probably, to some extent, that the primi- 
tive tubes occur in greater plenty in the peripheral layers, or rather 
that they are situated doser together, and that they are not to such 
extent separated by layers of the substance which occurs in plenty 
in the mesial parts of the protoplasm and give to it the deep staining 
(vide sequel). In these lightly stained layers, a spongioplasmic reti- 
culation, described above (cmfr. fig. 24), is generally more or less 
visible, in fig. 37 it is, for instance, very distinct, and thick fibres 
also occur (vide also fig. 38, B). 
In other cells such a reticulation is but slightly visible, and we 
find only circular meshes, which probably are transsected pri- 
mitive tubes, this is especially the case in cells where these layers 
are confined to masses distinctly defined from the rest of the pro- 
toplasm as, for instance, in fig. 38, A. Here, only a few such fibres 
or membranes of spongioplasm are visible {$'). ^) 
In ganglion cells with such peripheral masses of primitive tubes, 
the nervous processes do not spring directly from these masses but 
seem to get their whole contents from the mesial deeply stained 
^) I think it must have been ganglion cells with similar light peripheral masses 
which Freud mentions 1. c. i88l p. 29 — 30. He says: »An den grossen iinipolaren 
Zellen erscheint eine oft sehr breite, einen grosseren oder geringeren Theil der Zell- 
peripherie einnehmende Zone, welche durchaiis homogen und dem Kerninhalt ahn- 
lich ist.« He believes «dass diese homogene Zone durch den als «Zwischensub- 
stanzw beschriebenen Bestandtheil des Zellleibes gebildet wird, aus welcher die 
netzformige, dunklere Substanz sich gegen den Kern zuriickgezogen hat. Es finden 
sich auch haufig genug Zellen, an denen zwei homogene Randpartien durch einen 
dunnen Strang dunklerer, genetzter Substanz, welcher noch an der Peripherie fest- 
gehalten ist, getrennt werden.« Freud supposes, consequently, those «homogene 
Randpartien<f to be appearances produced on the death of the cell. In the 
sympatic ganglion cells, he describes somewhat similar masses of hyaline substance, 
which he, however, rather believes to be a normal appearance belonging to the 
live-state of the cells. 
It may here, also be mentioned that Freud describes (1. c. 1881 p. 26) and 
illustrates (fig. i & 5) nervous processes having a peculiar origin in the ganglion 
cells. He says of them: »In manchen Zellen ist ein Ubergangsstuck zwischen Zell- 
leib imd Nervenfaser nicht vorhanden; die Nervenfaser entspringt in anderer, sehr 
eigenthiimlicher Weise. Dieselbe schmiegt sich nahmlich in Gestalt eines hellen 
Halbringes der Peripherie der Zelle an, um dann in's Innere des Zellleibes einzu- 
treten.« Krieger (in his dissert. 1879) has before Freud (as Freud himself states) 
described similar appearances. I think there is no doubt that these structures are 
of the same nature as those described above respecting the origin of the contents 
•of the nervous process (vide p. 103 — 104). 
