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History of Animals   


back; and the hair on the pubes is the last to change colour.
Some hairs are congenital, others grow after the maturity of the
animal; but this occurs in man only. The congenital hairs are on the
head, the eyelids, and the eyebrows; of the later growths the hairs on
the pubes are the first to come, then those under the armpits, and,
thirdly, those on the chin; for, singularly enough, the regions
where congenital growths and the subsequent growths are found are
equal in number. The hair on the head grows scanty and sheds out to
a greater extent and sooner than all the rest. But this remark applies
only to hair in front; for no man ever gets bald at the back of his
head. Smoothness on the top of the head is termed 'baldness', but
smoothness on the eyebrows is denoted by a special term which means
'forehead-baldness'; and neither of these conditions of baldness
supervenes in a man until he shall have come under the influence of
sexual passion. For no boy ever gets bald, no woman, and no
castrated man. In fact, if a man be castrated before reaching puberty,
the later growths of hair never come at all; and, if the operation
take place subsequently, the aftergrowths, and these only, shed off;
or, rather, two of the growths shed off, but not that on the pubes.
Women do not grow hairs on the chin; except that a scanty beard
grows on some women after the monthly courses have stopped; and
similar phenomenon is observed at times in priestesses in Caria, but
these cases are looked upon as portentous with regard to coming
events. The other after-growths are found in women, but more scanty
and sparse. Men and women are at times born constitutionally and
congenitally incapable of the after-growths; and individuals that
are destitute even of the growth upon the pubes are constitutionally
impotent.
Hair as a rule grows more or less in length as the wearer grows in
age; chiefly the hair on the head, then that in the beard, and fine
hair grows longest of all. With some people as they grow old the
eyebrows grow thicker, to such an extent that they have to be cut off;
and this growth is owing to the fact that the eyebrows are situated at
a conjuncture of bones, and these bones, as age comes on, draw apart
and exude a gradual increase of moisture or rheum. The eyelashes do
not grow in size, but they shed when the wearer comes first under
the influence of sexual feelings, and shed all the quicker as this
influence is the more powerful; and these are the last hairs to grow
grey.
Hairs if plucked out before maturity grow again; but they do not
grow again if plucked out afterwards. Every hair is supplied with a
mucous moisture at its root, and immediately after being plucked out
it can lift light articles if it touch them with this mucus.
Animals that admit of diversity of colour in the hair admit of a
similar diversity to start with in the skin and in the cuticle of
the tongue.
In some cases among men the upper lip and the chin is thickly
covered with hair, and in other cases these parts are smooth and the
cheeks are hairy; and, by the way, smooth-chinned men are less
inclined than bearded men to baldness.
The hair is inclined to grow in certain diseases, especially in
consumption, and in old age, and after death; and under these
circumstances the hair hardens concomitantly with its growth, and
the same duplicate phenomenon is observable in respect of the nails.
In the case of men of strong sexual passions the congenital
hairs shed the sooner, while the hairs of the after-growths are the
quicker to come. When men are afflicted with varicose veins they are
less inclined to take on baldness; and if they be bald when they
become thus afflicted, they have a tendency to get their hair again.
If a hair be cut, it does not grow at the point of section; but it
gets longer by growing upward from below. In fishes the scales grow
harder and thicker with age, and when the amimal gets emaciated or
is growing old the scales grow harder. In quadrupeds as they grow
old the hair in some and the wool in others gets deeper but scantier

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