"Oh, I suppose it is all right," returned Dick, but he was by no means satisfied, although he could not tell exactly why. There was something about the new deck hand that did not "ring true." At first he thought to speak to his parent about the occurrence, but then concluded not to worry his father. Knowing that it was now a race between the _Rainbow_ and the _Josephine_ for Treasure Isle, Captain Barforth crowded on all steam. The course of the steam yacht was fairly well laid out, but it contained many turns and twists, due to the many keys--located in these waters. "We don't want to run on any hidden reef," said the master of the vessel. "If we do we may go down or be laid up for a long while for repairs. These waters are fairly well charted, but there is still a great deal to be learned about them. From time to time they have had earthquakes down here, and volcano eruptions, and the bottom is constantly shifting." On the second night out from Nassau, Sam, for some reason, could not sleep. He tumbled and tossed in his berth for two hours, and then, feeling that some fresh air might do him good, dressed in part and went on deck. It was not a very clear night, and but few stars shone in the firmament. In the darkness the lad walked first to one side of the steam yacht and then to the other. Then he strolled toward the bow, to have a little chat with the lookout. As he walked along the side of the cabin he became aware of a figure leaning over the rail, gazing far down into the sea. By the man's general form he made the fellow out to be Walt Wingate. The deck hand had hold of something, although what it was Sam could not tell. At first the youngest Rover was going to call to the man and ask him what he was doing. But he remained silent, and stepped into the shadow of the cabin as Wingate left the rail and crossed to the other side of the yacht. From under some coils of rope the deck hand brought forth something, lifted it over the rail and dropped it gently into the sea. Then he leaned far over the rail as before, and this lasted two or three minutes. "He is certainly up to something out of the ordinary," thought Sam. "I wonder if he is fishing? If he is, it seems to me it is a queer way to go at it." As Wingate left the rail he walked directly to where the boy stood. When he discovered Sam he started back as if confronted by a ghost. "Oh--er--didn't know anybody was up," he stammered. "It was so hot in my stateroom I couldn't sleep," answered Sam. "I came out to get the air." "It's almost as hot on deck as it is anywhere," said the deck hand, and his tone had little of cordiality in it. "I think I'll go forward and try it there." "Yes, it's a little breezier at the bow, sir. By the way, did you-- er--see me trying to catch some of those firefish just now?" "I saw you doing something, I didn't see what."