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. The next day it was less light, and in four or five days was
nearly its natural color. He also mentions two cases of sudden
blanching from fright.

Fowler mentions the case of a healthy girl of sixteen who found one
morning while combing her hair, which was black, that a strip the whole
length of the back hair was white, starting from a surface about two
inches square around the occipital protuberance. Two weeks later she
had patches of ephelis over the whole body.

Prentiss, in Science, October 3, 1890, has collected numerous instances
of sudden canities, several of which will be given:--

"In the Canada Journal of Medical Science, 1882, p. 113, is reported a
case of sudden canities due to business-worry. The microscope showed a
great many air-vesicles both in the medullary substance and between the
medullary and cortical substance.

"In the Boston Medical and Surgical Journal, 1851, is reported a case
of a man thirty years old, whose hair 'was scared' white in a day by a
grizzly bear. He was sick in a mining camp, was left alone, and fell
asleep. On waking he found a grizzly bear standing over him.

"A second case is that of a man of twenty-three years who was gambling
in California. He placed his entire savings of $1100 on the turn of a
card. He was under tremendous nervous excitement while the cards were
being dealt. The