The flickering light from the camp-fire disclosed as it did at first, the side and profile of the chieftain. Gradually the flames sank lower and there came moments when the sentinel was scarcely visible. Then, all at once, the fire would flare up for a few seconds and the figure would be in brighter relief than before. Again the eyes of Jack would rebel against the extreme tension to which they were subjected. The Indian, instead of remaining with his back against the oak, would seem to be hitching forward and upward in the most grotesque fashion. After bumping about in the air for a time, he would sink, still bumping, to the ground, where he would hitch backward to his place by the tree. Then the latter, instead of standing as motionless as a rock, showed signs of restlessness. It would begin by swaying back and forth until it too was waltzing in an unearthly fashion around the camp-fire. Again the surrounding gloom became studded with blinking stars, ogres and the most grotesque figures, which performed in an indescribable fashion. Darkness and light alternated, until the boy feared he was losing the power of vision altogether; but it will be understood that this was the natural protest of the eye against the painful and long continued strain to which it was subjected.