As soon as the child has acquired the knowledge of the motion, and his limbs are strong enough to support the weight of the body without injury, these machines are put aside, and the fourth contrivance is used. In this, the mechanism consists of a framework with very light and soft bandages, made with the plumage and down of birds. With these bandages the child's head, knees, elbows, wrists, shoulders, and loins are gently bound. The framework to which the bandages are attached has a projection from every point, on which the child, in case of accident, can possibly fall, and he is thus effectually protected; for, as the projection allows of his falling only slightly out of the perpendicular, the concussion is but slight, and the young one is only pressed gently on the soft down. As the child increases in strength, the projections are removed at intervals, one by one, commencing with those corresponding to the knees, the last removed being those protecting the head, which are retained for a long time. Even when they have been removed, the head is still guarded by a light turban with inside springs, made so as to yield gently to a blow, and thus save the head; so important is it considered to protect this superior portion of the human frame. When the bandages are first removed from the knees, the child has perhaps some falls; but these, the head and other parts being protected, are not attended with any serious consequences; and if the child actually falls, the sensation of pain he may experience may teach him to be more careful in future. Such lessons would, indeed, be valuable at all times; but they would be purchased at too great a cost if learned at the price of injury to body and mind. The use of these four instruments was followed by remarkable results; and they are thought of such great value to the community that the districts supply them gratuitously to the poor. Those thus charitably bestowed are less ornamental than the others, but equally efficient. THE TEETH.