all out from several parts of her head, so that before six
months were over she became entirely bald. In the beginning of January,
1819, her head became covered with a kind of black wool over those
places that were first denuded, and light brown hair began to develop
from the rest of the scalp. Some of this fell out again when it had
grown from three to four inches; the rest changed color at different
distances from its end and grew of a chestnut color from the roots. The
hair, half black, half chestnut, had a very singular appearance.

Alibert and Beigel relate cases of women with blond hair which all came
off after a severe fever (typhus in one case), and when it grew again
it was quite black. Alibert also saw a young man who lost his brown
hair after an illness, and after restoration it became red. According
to Crocker, in an idiotic girl of epileptic type (in an asylum at
Edinburgh), with alternating phases of stupidity and excitement, the
hair in the stupid phase was blond and in the excited condition red.
The change of color took place in the course of two or three days,
beginning first at the free ends, and remaining of the same tint for
seven or eight days. The pale hairs had more air-spaces than the darker
ones. There was much structural change in the brain and spinal cord.
Smyly of Dublin reported a case of suppurative disease of the temporal
bone, in which the hair changed from a mouse-color to a reddish-brown;
and Squire records a congenital case in a deaf mute, in whom the hair
on the left side was in light patches of true auburn and dark patches
of dark brown like a tortoise-shell cap; on the other side the hair was
a dark brown. Crocker mentions the changes which have occurred in rare
instances after death from dark brown to red.

Chemic colorations of various tints occur. Blue hair is seen in workers
in cobalt mines and indigo works; green hair in copper smelters; deep
red-brown hair in handlers of crude anilin; and the hair is dyed a
purplish-brown whenever chrysarobin applications used on a scalp come
in contact with an alkali, as when washed with soap. Among such cases
in older literature Blanchard and Marcellus Donatus speak of green
hair; Rosse saw two instances of the same, for one of which he could
find no cause; the other patient worked in a brass foundry.

Many curious causes are given for alopecia. Gilibert and Merlet mention
sexual excess; Marcellus Donatus gives fear; the Ephemerides speaks