The valley was wide enough so that he had no trouble in navigating up to the time that they reached Fall Creek, but beyond that whisps of clouds seemed to drop below the main mass and threatened to cut them off from the upper valley. When he could, Bill went under the low-hanging clouds, but after a while they hung right on the tree tops. Even at that he sometimes went through, but he could never tell what he was liable to meet on the other side. It was a dangerous proceeding, but could not be helped. Bill’s mission was to get to the reported fire, and if it was humanly possible he would do it.