The falling off of the hair is too frequent a result of anxiety, or other depressing emotion, to escape common observation. A case reported in the Lancet, of May 4, 1867, forms an excellent illustration:
business became established, and, coincidently, his hair reappeared; and when Mr. Churton, of Erith, reported the case, he had a moderately good quantity of hair on the head, very slight whiskers, rather better eyebrows, and the eyelashes pretty good."
The influence of painful emotions in causing gray or white hair and alopecia has been sufficiently illustrated, and it would have been interesting to adduce a reverse series showing the opposite effects of joy. But it is a very different thing to restore to its healthy habit the function of a tissue whose pigment has been removed by slow mal-nutrition, or by sudden shock. I may adduce such a circumstance as the following, however, to show that hair, which has turned gray in the natural course of life, may, by the stimulus of specially-favorable events, become dark and plentiful again: