He closes
his brief communication on the subject with the belief that it is
quite possible for black hair to turn white in one night or even
in a less time, although Hebra and Kaposi discredit sudden
canities (Duhring). Raymond and Vulpian observed a lady of
neurotic type whose hair during a severe paroxysm of neuralgia
following a mental strain changed color in five hours over the
entire scalp except on the back and sides; most of the hair
changed from black to red, but some to quite white, and in two
days all the red hair became white and a quantity fell off. The
patient recovered her general health, but with almost total loss
of hair, only a few red, white, and black hairs remaining on the
occipital and temporal regions. Crocker cites the case of a
Spanish cock which was nearly killed by some pigs. The morning
after the adventure the feathers of the head had become
completely white, and about half of those on the back of the neck
were also changed.
Dewees reports a case of puerperal convulsions in a patient under
his care which was attended with sudden canities. From 10 A.M. to
4 P.M. 50 ounces of blood were taken. Between the time of Dr.
Dewees' visits, not more than an hour, the hair anterior to the
coronal suture turned white.
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