Circumstances conspired to aid Jack in the investigation that succeeded. The sun was near setting, but a stream of golden light gleamed over the waters, particularly illuminating the portion which came within the field of the glass. Then Harry, in his efforts to escape from the rock, and to get nearer to the edge of the main channel, where his chances of being seen and rescued would be ten-fold what they were on his rock, had moved south, by following the naked reef and the shallow places, and was actually more than a league nearer to the brig than he would have been had he remained stationary. There had been hours in which to make this change, and the young man had probably improved them to the utmost. Jack watched the form that was wading slowly along with an interest he had never before felt in the movements of any human being. Whether Mulford saw the brig or not, it was difficult to say. She was quite two leagues from him, and, now that her sails were furled, she offered but little for the eye to rest on at that distance. At first, Jack thought the young man was actually endeavoring to get nearer to her, though it must have been a forlorn hope that should again place him in the hands of Spike. It was, however, a more probable conjecture that the young man was endeavoring to reach the margin of the passage, where a good deal of rock was above water, and near to which he had already managed to reach. At one time Jack saw that the mate was obliged to swim, and he actually lost sight of him for a time. His form, however, reappeared, and then it slowly emerged from the water, and stood erect on a bare rock of some extent. Jack breathed freer at this; for Mulford was now on the very margin of the channel, and might be easily reached by the boat, should he prevail on Josh, or Simon, to attempt the rescue.