Page:Popular Science Monthly Volume 2.djvu/172

 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:

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: