6 
that in this mass upon the summit of the papilla of the Hyla 
there is more than the single layer of cells represented by 
Hartmann, who is the latest observer on this point. 
Hartmann’s representation (/. c.) of this very same struc- 
ture from the summit of the papilla of the Hyla is very 
different from my drawings. Not only do we represent these 
same cells of very different shapes, but the nucleus in my 
specimens is three or four times as large in proportion to the 
cell as represented by him. 
The general outline of the free surface is convex (a, a, a, 
fig. 1, PI. I), and the tissue which intervenes between the 
nuclei appears very transparent and projects a little, so as to 
give the convex summit a honeycombed appearance (PI. II, 
%• 7 )- 
The under concave surface of this hemispheroidal mass 
which adheres to the summit of the papilla of the Ilyla’s 
tongue, corresponds to the exact area over which the nerve- 
fibres of the papilla are distributed, as will presently be 
shown. The shape of these cell-like bodies, of which the 
mass is composed, and their connexion with fibres, is shown in 
PL II, fig. 3, and in the very highly magnified specimen repre- 
sented in fig. 2, PI. I. These figures, I believe, represent the 
actual arrangement, but the point is most difficult of investiga- 
tion. In the intervals between what would be called, if they 
were capable of complete separation from one another, the in- 
dividual cells, fibres are seen. These fibres do not, I think, 
arise simply from the pressure to which the masses have been 
subjected. I have represented the arrangement as I believe 
it to be in PI. II, fig. 6, from the central part of one of the 
hemispheroidal masses. I regard the entire hemispheroidal 
mass as resembling in its essential structure the network I 
have described at the summit of the papilla, but the masses 
of germinal matter are so very close together and the fibres 
60 much interlaced with one another, that it is most difficult 
to unravel the mass without destroying it. The arrange- 
ment at the surface is seen in PI. II, fig, 7. 
The epithelium of the tongue generally is easily removed, 
but many of these hemispheroidal masses remain connected 
with the summits of the papillae to which they belong. From 
what I have stated, it will, I think} be admitted that, the con- 
stituent parts of the mass at the summit of the papilla could 
not be properly called epithelial cells, so that, with reference 
to the termination of the nerves in the papilla, I think it is 
more correct to say that nerves may be traced to special 
bodies or cells which form a hemispheroidal mass attached to 
the summit of the papilla, than to assert that the separate 
