— 130 — 
In the course of some processes dichotomous subdivisions are 
very common, and the branches of the process subdivide, again, into 
smaller and smaller branches, this seems to continue until the whole 
process is broken up into a great many fine primitive tubes or 
fibrillæ, and its individuality is, consequently, quite lost. I have not, 
yet, been able to trace any process to its division into the finest 
tubes, but from the little I have seen, however, I believe that I 
am entitled to conckide that such must be the case. Fig. 63, a 
and h represent pieces of such processes, which are drawn under 
the camera iucida direct upon the stone; fig. 70 represents a gang- 
lion cell with such a process. 
A great many processes have quite another character. I have 
been able to trace them for long distances through the ganglia, 
in one case even directly into the root of a nerve, without seing 
any subdivision. They have, however, no isolated course; at 
certain intervals they give ofi* slender side-branchlets which often 
subdivide in the dotted substance. At the places where such 
branchlets issue, the nervous processes have generally small thicken- 
ings or varioceles. I think that all the nervous processes of this 
type pass to a commissure or peripheral nerve, and become a com- 
missural or peripheral nerve-tube. We may thus say, of these 
nervous processes, that they heep their individuality, hut have no 
isolated course. Fig. 64, a, h, c, d represent nervous processes of 
this kind; fig. 68 and 69 represent ganglion cells with such processes. 
We may thus establish two types of nervous processes viz. 
i) nervous processes which lose their individuality and are entirely 
broken up into slender primitive tubes and fibrillæ, and 2) nervous pro- 
cesses which heep their individuality and pass through the dotted 
substance of the ganglia, forming a nerve-tube, but which have no 
isolated course, side-branchlets being given off on the way through 
the dotted substance. 
We have, before, said that the nervous processes subdivide, and 
give off branchlets also before the reach they dotted substance. The 
branches and branchlets which arise in this way seem, however, 
chiefly, if not wholly, to penetrate into the dotted substance; they 
frequently enter into this substance together with the thicker nervous 
processes, as will be seen in fig. 64, e, f, where several such branches 
are represented. It seems, thus, not to be of any essential import 
whether the nervous processes subdivide in or outside the dotted 
substance, as in both cases the branches penetrate into it and be- 
come one of its constituents. 
