Turning next to the idea set forth by Dr. Buchanan as to the greater preponderance of ambidexterity or left-handedness among females, the results of my own observation by no means tend to confirm this. I have already noted the case of a lady whose left-handedness is accompanied by great dexterity. I have repeatedly met with cases of ladies who use the needle skilfully with the left hand; but the results of inquiries addressed to musicians and music teachers indicate that in the great majority of cases the cultivation of the left, as the weaker or less skilful hand, has to be sedulously enforced in the training of the female organist and pianist. It is because left-handed pianists are rare that their exceptional dexterity is noted, as in the case of a Canadian lady referred to above: “She had great advantages from her left-handedness. She was a very good performer on the piano, and her bass was magnificent.” Again as to the pirouetting of the trained ballet-dancer, I have been assured that much practice is required to obtain equal facility on either foot. Dr. Buchanan traces the development of the limbs in their active use from the first effort of the child to stand erect; next, the learning to balance itself and turn round on a single foot, and so through a succession of stages, until at length “the child becomes right-footed. It is not till long after that the right arm acquires its predominance.” But the co-ordination of the right or left hand and the corresponding foot is by no means so invariable as to justify any such theory. Hopping, pirouetting, and standing on one foot are comparatively exceptional actions. The two lower limbs are most frequently employed in necessarily alternate locomotion. The use of the lower limbs, moreover, is much more independent of direct conscious volition than that of the hands, and the purposes to which their action is applied are rarely of a nature to invite special attention to them. There is, however, an instinctive tendency with many, if not indeed with the majority, to use one foot in preference to the other, but not necessarily the corresponding one to the dexterous hand, be it right or left. In skating, for example, where military training has not habituated to the use of the left foot in starting, most persons have an instinctive preference for one foot. So also in football, it is not with most players a matter of mere chance which foot will be used in starting the ball. Possibly the same reason may help to account for the invariable tendency of a blindfold walker to deviate to one side or the other. It is scarcely possible to walk in a straight line with the eyes shut. The one leg apparently tends to outwalk the other. Guided mainly by my own experience, I remarked, when first writing on this subject, that “the same influences appear to affect the whole left side, as shown in hopping, skating, football,” etc. But this is partial and uncertain. Dr. Brown-Sequard affirms that right-sidedness affects