Richelot observed white mottling of hair in a girl sick with
chlorosis. The whitening extended from the roots to a distance of
two inches. The probable cause was a temporary alteration of the
pigment-forming function. When the chlorosis was cured the
natural color returned. Paullini and Riedlin, as well as the
Ephemerides, speak of different colored hair in the same head,
and it is not at all rare to see individuals with an anomalously
colored patch of hair on the head. The members of the ancient
house of Rohan were said to possess a tuft of white hair on the
front of their heads.
Michelson of Konigsberg describes a curious case in a barrister
of twenty-three affected with partial canities. In the family of
both parents there was stated to be congenital premature
canities, and some white hairs had been observed even in
childhood. In the fifteenth year, after a grave attack of scarlet
fever, the hair to a great extent fell out. The succeeding growth
of hair was stated to have been throughout lighter in tissue and
color and fissured at the points. Soon after bunches of white
hair appeared on the occiput, and in the succeeding years small
patches of decolored hairs were observed also on the anterior and
lateral portions of the scalp.
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