For years it was O.'s custom when out walking to clasp his hands behind his back, bend his body forward, and hold his chin in the air, and this habit explains his attitude tic of to-day. The ludicrousness of it was early impressed on him, but instead of adopting the obvious solution of the difficulty, he proceeded to devise a whole series of intricate measures to regain the correct position--measures which he picturesquely names _para-tics_. At first he used the curved handle of his cane to pull on the brim of his hat, and so depress his head; a subsequent modification consisted in putting the cane under his chin and pressing down on it. Each of these subterfuges attained a degree of success, and that in spite of the fact that in one case the extensors, and in the other the flexors, of the head were being resisted: in other words, each was efficacious so long as O. chose to consider it so. Eventually their serviceableness dwindled, and O. conceived the plan of slipping his cane between his jacket and his buttoned overcoat so that the chin might find support against its knob. In the movements of walking, however, contact between the two was never maintained--each was for ever seeking the whereabouts of the other; and while it mattered little that this incessant groping and jockeying wore out several suits and the lining of several overcoats, the more serious result was the acquisition on O.'s part of the habit of making various up-and-down and side-to-side movements of his head, which continued to assert themselves, though chin and cane were no more in proximity. It was not long ere the ceaseless intrusion of his head tics drove him every moment in search of a support for his chin. To read or write he was forced to rest it on a finger, or on his fist, or hold it between two fingers, or with his open hand, or with two hands, although the distraction provided by a serious occupation sufficed to banish the impulse and stay the tics. A day came when application of the hand no longer seemed calculated to ensure immobility of the head, whereupon he hit on the idea of sitting astride a chair and propping his chin against it. This idea had its day, and the next move was to press his nose against one end of the chair back. Each successive stratagem was of marvellous promise at the outset, but its inhibitory value rapidly deteriorated and new plans were concocted.