64 A. B. MACULLUM. 
layers of the epithelium, in the same preparation intercullular 
and intracellular fibrils and terminations can be seen as easily 
as in the superficial layer. Here also the intercellular termi- 
nations are much larger and more distinct. If the preparation 
is one in which the intercellular fluid is precipitated in the 
form of bluish droplets, there is no necessity for isolation of a 
cell in order to determine whether nerve-fibrils terminate in its 
interior, because all the outlines of the cells are rendered very 
plain. A study of the optical section of one of these cells gives 
the same results as in the case of one of the superficial cells. 
In fig. 5 several of the cells of the basal layer are represented 
with their nerve terminations. 
In some preparations the figures of Eberth cannot be seen 
at all owing probably to some unfavorable action of the 
reducing fluid. Where, however, they appear quite distinct 
one or more violet fibrils are seen to terminate in them. The 
figures remain colourless in the more or less tinted protoplasm 
of the cell. It is not uncommon when the preparation has 
stood long in formic acid to have a number of the cells broken 
down, with the figures lying free in the mounting fluid. Then 
one can see very plainly in them the axial, violet-coloured 
fibrils and their beadlike terminations as indicated in fig. 7. 
This reveals plainly that the figures of Eberth are simply 
sheaths for intracellular nerve terminations. As such they 
exist all over the body of the tadpole, and are not confined to 
the tail. Fig. 6 is drawn from one of my preparations of the 
skin in the immediate neighbourhood of the mouth. In this 
case the branching nerve-fibril with three cells lies isolated 
from the rest of the tissues in the mounting fluid. There one 
of the branches of the fibril is seen to terminate in the interior 
of an oval refracting body, a figure of Eberth, from which the 
cell enclosing it has been torn away. 
These figures of Eberth have been compared to the clavate 
cells in the skin of Petromyzon and Myxine. But the struc- 
tures known as the cells of Leydig in the skin of Amphibian 
larve are really clavate cells, and in these I have sometimes 
seen figures of Eberth. The cells of Leydig are not very 
