"21. The gait of a person addicted to this vice will usually betray him to one who has learned to distinguish the peculiarities which almost always mark the walk of such persons. In a child, a dragging, shuffling walk is to be suspected. Boys, in walking rapidly, show none of that elasticity which characterizes a natural gait, but walk as if they had been stiffened at the hips, and as though their legs were pegs attached to the body by hinges. The girl wriggles along in a style quite as characteristic, though more difficult to detect with certainty, as females are often so “affected” in their walk. Unsteadiness of gait is an evidence seen in both sees, especially in advanced cases."