68 MORRILL. [VoL. XIV. 
The cells associated with the nerve endings he considers as 
nerve cells. He found contiguity but no continuity. Niemack 
considers it possible that the two kinds of ending indicate two 
different functions. In his figures the nerve cells are repre- 
sented as deeply stained. 
Bethe ('94), in his study of the frog’s tongue and palate with 
a modification of Ehrlich’s method, found two kinds of cells 
reaching the surface of the terminal disc and several kinds of 
nerve endings: 
I. Free endings between the cells and reaching the surface. 
2. Endings on or in the epithelial cells. 
(a) On cylindrical cells with three lobes (dreilappigen). 
(b) With round end plate on rod cells, forked cells, 
and deep cylindrical cells. 
These different endings may come from branches of the 
same nerve. 
The terminal enlargements were found by Bethe on the 
margins of the terminal discs and sensory elevations rather 
than in the center. 
He questions the accuracy of Niemack’s conclusion that a 
free ending is found between every two cells. The second kind 
of ending is found in the middle of the terminal disc and is 
generally enlarged and knob-like at the end. 
The terminal enlargement of the nerve is firmly adherent to 
the cell, and admits of the cell being moved about without 
becoming detached. With a one-sixteenth oil immersion it 
appeared to be intimately joined to the cell. 
No continuation of the terminal enlargement or end plate 
into the cell was observed. 
The nucleus was counterstained with alum cochineal and 
could be easily distinguished, except in the cylindrical cells, 
where it was hidden by granular matter. 
Bethe claims to be the first to demonstrate the threefold 
nature of the nerve endings. They show a distinct clover-leaf 
shape from the surface, but look like flat discs when seen from 
the side. 
The position of the nerve ending on the cell varies, being at 
