Chronic Chorea.

This can hardly be said to amount to a disease. It consists rather in uncouth tricks, arising from some slight disorder of particular muscles, and grown into a fixed habit, such as shaking of the head every three to twenty seconds, repeated squinting of the eyes in connection with a peculiar knitting of the eyebrows, wrinkling of the nose, shrugging of the shoulders, lifting the ears up and down, or even moving the whole scalp back and forth. These movements are commonly made without a consciousness of it; and generally there is no power to suspend them without a painful effort which cannot be easily continued.
No medical treatment is of any avail. These tricks can only be corrected by great watchfulness and effort on the part of the person suffering from them, and in many cases, not even by such means.