A young woman twenty years of age first began to suffer from convulsive tics five years ago. Without any warning she used to bend down as if with the intention of picking up something, but she had to touch the ground with the back of her hand, else the performance was repeated. Twenty or thirty times a day this act was gone through; in the intervals she kept turning her head to the right, looking up at the curtains in a corner of the window, and at the same time making a low clucking sound that attracted the attention of those in the room. For nine or ten years these two tics have prevailed, and have been accompanied with certain obsessions, such as the impulse to count up to three, to regard any person or object three times, etc. With the generalisation of the convulsive movements various phobias have made their appearance--viz. fear of horned animals, of earthworms, of cats, of blight, etc. Onomatomania is another form of obsession which may be mentioned, exemplified by the dread of uttering some forbidden word, or by the impulse to intercalate some other. The term _folie du pourquoi_ has been applied to the irresistible habit of some to unearth an explanation for the most commonplace of facts: "Why has this coat six buttons?" "Why is so-and-so blonde?" "Why is Paris on the Seine?" etc. This mode of obsession is frequent among those who tic, and is curiously reminiscent of a familiar trait in the character of children, thereby supporting our contention of the mental infantilism of all affected with tics. Prominent among the mental anomalies of the subjects of tic are found different sorts of phobia: fear of death or of sickness, of water, knives, firearms--topophobia, agoraphobia, claustrophobia, etc. The following most instructive case has been observed by one of us over a period of several months: S.'s earliest attack of torticollis, of two or three days' duration merely, occurred when he was fifteen years old, and was attributed by his mother--whose mental peculiarities, in especial her fear of draughts, are no less salient than those of her son--to a chill occasioned by a flake of snow falling on his neck. S. is so blindly submissive that he accepts this pathogeny without reserve. Five years ago a second torticollis supervened, which still persists to-day, and of which his explanation is that he was obliged, when standing at a desk, to turn his head constantly to the left for two hours at a time in order to see the figures that he had to copy, and was forced, after the elapse of some months, to relinquish his work owing to pain in the occipital region and neck. From that moment dates the rotation of his head to the left.