A COMPARATIVE STUDY OF STRIATED MUSCLE. 41 
stance of the ganglion-cells is found, when hardened and 
examined in sections (fig. 20), to be permeated by a system of 
excessively fine threads. These are partly arranged in vortices 
around the nuclei, and from this they are continued in a radiat- 
ing direction to the bases of the processes which they enter, 
each process seemingly being made up of bundles of these 
threads. 
The ganglion-cell forms only a small part of the core of the 
fibre. All the rest is occupied by a granular protoplasmic 
material, throughout which there runs a network of very fine 
threads, forming the network of the core (see fig. 1) ; these 
threads are connected with annular or stellate cells, having very 
distinct nuclei. The protoplasmic core with its network sends 
off processes which enter the larger fissures in the muscle sub- 
stance, and fine branches from these are continuous with the 
interfibrillar substance and its longitudinal threads; but the 
nuclei are only to be found in the central core and the larger 
fissures, there being none in the substance of the muscle. 
This network of the core is, perhaps, to be regarded as 
a supporting tissue for the protoplasmic core; though it 
is also intimately connected with the fine branches of the 
nerve processes of the ganglion-cell and with the networks 
of the muscle substance. Special branches of the nerve pro- 
cesses, however, ramify over the surface of the latter, and often 
follow the lines of the transverse networks, with which they 
probably enter into connection. 
Each of the ganglion-cells in the outer end of the core of 
a fibre communicates with each of its two adjoining neighbours 
of the same row by a single unbranched process (figs. 18 and 
19), and all the ganglia belonging to one row of fibres are thus 
united together into a chain which runs immediately underneath 
the corresponding loop of non-striped muscle. Like the latter, 
the chains of ganglion-cells are all interrupted along the line of 
the dorsal and ventral raphes, which are at right angles with 
them. Here they join a thicker longitudinal band of a pig- 
mented protoplasmic substance, similar to that of the chains 
themselves, which runs along the raphe, and, when traced to 
