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.
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