PROCEEDINGS OF SOCIETIES. 305 
3. Further changes in the ganglion-cell after its formation. 
Under this head the movement of the cell from the point 
where its growth commenced is described. It is shown that 
the two fibres, which at first seem to come from opposite 
extremities of the cell, le parallel to each other. They 
increase in length, and subsequently one is seen to be twisted 
round the other, as shown in the figure. Sometimes the 
fibres below the point where the spiral arrangement exists 
run parallel for a long distance, but at length pursue oppo- 
site directions. The author considers that the formation of 
the ganglion-cell commenced at the point where the fibres 
diverge, and that subsequently the cell moved away,—the 
parallel fibres, which at length become straight and spiral, 
being gradually formed or drawn out as it were from the 
cell. 
4. Of the spiral fibre‘of the fully formed ganglion-cell, 
The spiral fibre or fibres can be shown to be continuous 
with the material of which the body of the cell is composed, 
as well as the straight fibre, but the former are connected 
with its surface, while the latter proceeds from the deeper 
and more central part of its substance. 
There are many nuclei in connection with the spiral fibre, 
and several nuclei of the same character imbedded in the 
substance of the mass of which the cell is composed. These 
latter nuclei seem to be connected with an earlier condition 
of the matter which becomes, when more condensed, spiral 
fibre. A great difference is observed with regard to the 
extent of the spiral fibre in cells of different ages. In the 
youngest cells the fibres near the cell are both parallel to 
each other, but as the cell grows one is seen to be coiled 
round the other ; and the number of coils increase as the cell 
advances in age, while the matter of which the fundus of the 
cell is composed gradually becomes less—apparently in con- 
sequence of undergoing conversion into fibres. Nuclei are 
found in the course of the straight fibre, as well as in connec- 
tion with the spiral fibre. Nuclei have been demonstrated 
in connection with the dark-bordered fibres near their origin 
and near their distribution in all tissues. 
Next follows a discussion “on the essential nature of the 
changes occurring during the formation of all nerve-cells, and 
on the formation of spiral fibres,” but this is not adapted for 
