208 
HISTOLOGY OF ANIMALS. 
FIG. 158. 
‘fSr, , 
o® c ' 
* * lH'"# A C?> . 
*» -j a « -** *•--*- 
? c ;i 
/5o&, • F?S 
face, the pigment decreases in quantity, and the cells 
become flattened into the form of scales, from which the 
pigment is absent. A portion of the cuticle of a Negro 
with its inner or attached surface uppermost, which 
has been dried before being mounted in Canada-balsam, 
exhibits cells of a more or less hexagonal figure, contain- 
ing the pigment. In another specimen from the same 
skin, Fig. 158, the disposition of the cells is better 
shown. The preparation is 
mounted in fluid ; and it may 
be noticed that the surface is 
pitted, and that the greater 
part of the pigment-cells are 
arranged around the depres- 
sions, into which the papillae 
of the true skin are received, 
these depressions being the 
white parts of the figure. 
A vertical section of the skin 
of the nose having a stra- 
tum of black pigment in 
the deepest portion of the 
cuticle, while the upper part 
is quite white, is represented 
in Fig. 159. The speci- 
men is interesting in another 
point of view, as several 
the nose : a, cuticular layer hav- . . 
ing a band of pigment on its at- hairs, B B, are Visible in the 
tached surface, b b, hairs and . , , . . 
sebaceous follicles. cuticle, each having seba- 
Pigment cells on the under sur 
face of the cuticle of a Negro. 
fig. J59. 
