"Yes, yes, but never mind about that. Don't look behind you, just look straight ahead. I don't know that there's anything there anyhow, but it is always a good plan to look the way you're going to avoid accidents."

"You're a funny fellow, Jack," said the other. "You don't want me to see the sharks and be frightened."

"That's all right, old man, but there are no sharks at present, and if any come they will be too busy taking bites out of the other to bother me for a time. H'm! they are putting about. That's all right."

"You can carry me and swim yourself all right, Jack?" asked Jesse W. "Maybe I can swim a bit myself now."

"Never you mind about that," said Jack. "You just stay on my back till I tell you to get off," and the boy swam with a good, steady stroke toward the approaching yacht, keeping a lookout for sharks, as he knew they would be sure to appear soon, seeming to scent blood for miles.

Without letting the younger boy know that he was on the lookout he kept a strict watch on all sides for more of the rapacious creatures, and at length discovered two making for him in different directions, one of them suddenly appearing between him and the yacht, which was rapidly approaching.

"That fellow will be frightened off or perhaps go under the vessel," he thought, "but the other one is coming on pretty fast. I hope he won't get to the yacht before me."

The people on the yacht saw the shark between them and Jack, and Dick Percival seized a gun from the captain, aimed at the creature and fired, doing no great damage, but causing the voracious monster to rush off to one side, and out of his direct course.

Sharks have other fish to guide them, and without these they are helpless, which was the case with this one, who, in his sudden change of course, got away from his pilots, and had to be hunted up by them before he could get his bearings on the boys in the water.

This created a diversion in Jack's favor, and he swam on sturdily, splashing and kicking, and making a great disturbance to frighten away the second shark, which was coming alarmingly close to him.