1897.] Hair and Feathers. : 769 
follicle two other layers are seen, known by the names of 
those who first described them, the outer as Henle’s layer, the 
inner as Huxley’s layer. 
At one side of the folli- 
cle is shown the gland 
which secretes the oil, 
and which is clearly a 
derivation of the epider- 
mis, while in several 
places are medullated 
nerve fibres connected 
with the sheath of the 
hair. The growing 
point of the hair is at 
the base of the follicle 
where the deeper epi- 
dermal cells, by con- 
stant division, produce 
other cells, which are 
Diagrammatic section of hair and added to the base of the 
¢, cortical layer of hair; ct, Ea ea tapes e hair, thus causing it 
nd; he, Henles continually. to increase 
odes he — agaga m, —— Page in length. 
and y, ‘polis regahGeil by. Maater tac iotas: It may be well to say 
gous with x and y of figure 13 with which parenthetically that 
hair is not hollow; that 
the natural oil does not flow through it as through a tube, 
and that the singeing so strongly recommended by barbers 
will not close up any “openings through which the vital 
fluids of the hair escape.” 
When we look at any hairy surface the hairs appear to be 
arranged without any order. It is, however, interesting to 
note, in the light of what is to follow, that Maurer claims that 
the first hairs to be formed—at least in certain mammals— 
are arranged in a few rows, and that these rows have a definite 
Position (fig. 4). With the later increase in the number of the 
hairs this regularity is lost, an intermediate stage showing 
the hairs arranged in groups, but itis not yet settled exactly how 
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RAAE e, 
7, gr pte r Eh 
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