NERVE TERMINATIONS OF THE TADPOLE. 63 
be seen minute beadlike bodies of an intensely violet colour, 
which, if the micrometer screw is moved gently and slowly, can 
be observed to pass below into minute fibrils of the same colour. 
These are the intercellular nerve terminations described by 
Mitrophanow, who, however, does not represent them in his 
figures as numerous as they really are. 
But this is not all that can be seen in the same field. If 
one carefully scans the optical section of one of the cells, points 
much smaller than the intercellular ones appear in the imme- 
diate neighbourhood of the nucleus. Careful focussing also 
shows that the majority of them are simply the terminations of 
minute intracellular fibrils. Very often these points rest above 
the nucleus, and the fibrils connected with them take a curve 
corresponding to the surface of the nucleus, bending around 
and under it. Two, three, and sometimes four and five such 
fibrils can be found in a cell. They are undoubtedly nerve 
terminations, for their origin can without difficulty be found 
in the intercellular fibrils. Fig. 3 gives a view of the relative 
sizes of the two modes of termination. Both in successful 
gold preparations have the same depth of tint. 
If now it is desirable to see more definitely whether the 
fibrils which appear within the cell are really within, portions 
of the epithelium must be taken which have been some hours 
longer in the reducing fluid than is usual. A number of cells 
will then be completely isolated, and one can see distinctly the 
intracellular fibrils and endings in each, sometimes a little 
above, sometimes in a plane with the optical section of the 
nucleus. Fig. 4, @ represents a view of one of the isolated 
cells. In these same preparations it 1s sometimes possible to 
see the intercellular endings as club-shaped, deep violet bodies 
lying scattered in the mounting fluid. 
Sometimes in a superficial cell a series of granules, brownish, 
but less intense in colour than pigmentary substance, is 
arranged in the form of a curve around the nucleus, in such a 
way as to give rise to the idea that they are the degradation 
products of a figure of Eberth. 
in focussing for the cells of the intermediate and basal 
