It cannot be denied that in many cases of tic this exaggeration of the normal movement is anything but obvious; many conform absolutely to the definition of Meige and Feindel, except that the movements are not violent, or grotesque, or "caricatures." To withhold the term "tic" on this account would be rather unfortunate, especially since no standard exists whereby to estimate exaggeration. Enough has been said, however, to demonstrate how insignificant are the discrepancies between the rival definitions. Another question recently raised by Cruchet is the possibility of the persistence of tic during sleep. The evidence he has adduced in favour of this has now been accepted, as far as tics of the neck are concerned, by Meige. They are leas abrupt and less frequent, it is true; otherwise, they are identical with the movements of the waking hours. A case of a hiccoughing tic persisting in sleep has come under my own observation within the last few months. Now, it is not difficult to understand that a movement such as tic, which occurs during the conscious state in spite of the will of the subject, may arise when consciousness is diminished. In fact, one wonders why they are not more frequently remarked, seeing that they are habitual movements, and habit movements are by no means uncommon in sleep. It is highly probable, of course, that the observation of the watcher is not minute enough, but there is another reason. The peculiarity of all, or almost all, of these habitual movements in sleep is that they are rhythmical--we may instance the head nodding and head rolling of children; but it is a noteworthy fact that they are often regulated by respiration. When it is recalled how respiratory drill is eminently calculated to diminish the frequency and lessen the severity of very many tics, it will be admitted that the regularity of the respiratory movement in sleep is the most likely explanation of the infrequency of tic during that period.