We had accomplished three or four miles, and I had begun to wonder why Uncle Mark had not overtaken us, as he was a quick walker, and intended to carry only his axe, and a small skin bag over his shoulder containing some necessaries.  We were looking about us, in the hope of catching sight of a raccoon or opossum, or some larger game, when a howl, such as had aroused us one night a short time before, sounded through the forest.