74 MORRILL. [VoL. XIV. 
closely crowded hair cells were found at two slightly different 
levels, as shown by the position of their nuclei. The hairs of 
the hair cells were often lacking, but in many cases were so 
perfectly preserved that the individual hairs could be distinctly 
seen with the oil immersion lens. It was noticed that the 
nerve fibers often took the stain more perfectly at the edges of 
the crista than elsewhere, no stain being seen at any other 
part in some cases. 
The terminal enlargement of the nerve fiber, deeply stained, 
was almost invariably surrounded by a clear, lightly stained vesi- 
cle, and was always present, whether the fiber showed varicosi- 
ties or not. No indication of the clover-leaf (dreilappig) nerve 
termination observed by Bethe (94) in contact with the cells 
was seen. The nerve endings in contact with the hair cells 
showed essentially the same structure as the free endings. 
Occasionally free endings were found in the central parts of 
the epithelium (Fig. 22), where the relation of the parts had 
not been disturbed. In some cases the nerve fibers branched 
at the base of the hair cell, the two parts closely adhering to 
the cell, and ending in enlargements at nearly the same level 
on opposite sides of the cell (Figs. 14, 16-18). In others 
the branches were not associated with the same cell (Fig. 12). 
Nerves ending at the very base of the cell (Figs. 15, 19, 20) 
were also observed. The hair cells were very rarely stained, 
while the nucleus was often faintly outlined, but never deeply 
stained. 
A considerable number of cells were observed in which, if 
the cell had been deeply stained, it would have been impossible 
to prove that the nerve fiber did not enter the hair cell (Figs. 
5, 9, II, 13, 16, 17, 19, 20, 23). In cases such as those shown 
in Figs.9g and 13, where the nerve ends at the very base of the 
cell, no continuation of the fiber into the cell could be seen. In 
many specimens where the nerve fiber in contact with the cell 
was deeply stained, an effort was made to trace a connection 
between them by following the nerve fiber into the cell. It was 
always unsuccessful, although the outer parts of the cell were 
semitransparent. In a single case, where the cells had become 
separated from their neighbors, it looked as if the fibres could 
