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.