He saunters down his own backyard, springs to the top of the fence with one easy bound, drops lightly down on the other side, trots across the right-of-way to a vacant allotment, and skips to the roof of an empty shed. As he goes, he throws off the effeminacy of civilisation; his gait becomes lithe and pantherlike; he looks quickly and keenly from side to side, and moves noiselessly, for he has so many enemies—dogs, cabmen with whips, and small boys with stones.