Communications are also on record of local decolorization of the eyebrows and lashes in neuralgias of isolated branches of the trigeminus, especially of the supraorbital nerve.
Temporary and Partial Canities .-- Of special interest are those cases in which whiteness of the hair is only temporary.

Thus, Compagne mentions a case in which the black hair of a woman of thirty-six began to fade on the twenty-third day of a malignant fever, and on the sixth day following was perfectly white, but on the seventh day the hairs became darker again, and on the fourteenth day after the change they had become as black as they were originally.

Wilson records a case in which the hair lost its color in winter and regained it in summer.

Sir John Forbes, according to Crocker, had gray hair for a long time, then suddenly it all turned white, and after remaining so for a year it returned to its original gray.
Grayness of the hair is sometimes only partial.

According to Crocker an adult whose hair was generally brown had a tuft of white hair over the temple, and several like cases are on record.