I need not enter into a description of the characteristics of tics in this place. I may merely mention that tics have two aspects--a psychic and a physical. It is, in other words, a psychoneurosis. The characteristic mental state is one of doubt, of indecision, of inadequacy, of restlessness, of tension, of discomfort and of dissatisfaction, which is more or less unappeasable and irrepressible and uncontrollable until it finds vent in a rather explosive series of motor expressions which, as it were, are the safety valve for the peculiar feeling of tension and discomfort which the individual has been experiencing and which is accompanied by a sense of relief, satisfaction and a relative degree of comfort and mental rest. The mental imperfection (Charcot) of the ticquer is a polymorphic psychic defect (Brissaud, Meige and Feindel) characterized by mental infantilism; for ticquers, like other psychoneurotics, are like big children. They have the mind of children, in respect to the emotional make-up. The mental condition of ticquers is especially characterized by the imperfection or weakness of volition, by a certain degree of mental instability and lack of inhibitory control of the desires, tendencies, activities and motor expressions of the individual, this defect laying the groundwork for the impulsions and obsessions, as also for hysterical, so-called neurasthenic, hypochondriacal, depressive and so-called dementia praecox reactions. The tic movement is the symbol of the psychic defect or degeneration or instability. The earlier investigators were responsible for the differentiation of the tics from such other conditions as Sydenham's chorea, Huntington's chorea, the spasms, the stereotypies, the habit movements, the myoclonias, and other allied conditions. It is due to their pioneer work that tics were recognized as a definite and distinct clinical entity. The process of disintegration of these various movements and their differentiation one from the other cannot be overvalued. Among those who have contributed most to this subject may be mentioned Magnan and his pupils, especially Saury and Legrain, Gilles de la Tourette, Letulle, Guinon Noir, Pitres, Cruchet, Grasset, Trousseau, Charcot, Brissaud Meige and Feindel. Although Trousseau recognized the the ticquer was mentally abnormal, it was Charcot who first called definite attention to the psychic origin of the condition and to the fact that tic was indeed a mental disorder, a psychoneurosis, a psychomotor reaction. His lead was subsequently followed up by Brissaud, and by the latter's pupils Meige and Feindel, the latter two authors giving us a comprehensive discussion of the subject in their well-known classic. [1]More recently the Freudian school has attempted to dig down into the roots of the tree which ultimately sends forth its branches in the guise of tics.