“Heat doesn’t bother a man when he is in training,” said Tom. “It’s the flabby fellows that get sun-strokes. Sun does one good when he’s hardened to it.”

He fished out a pair of old boxing-gloves, that looked as though they had seen hard service, from the chest, and then he and Bob went at it, as though they had been the most bitter enemies, instead of the most inseparable of friends. They led and countered and pummelled each other till the perspiration poured down their faces and they had begun to breathe hard.

“Time!” cried Tom. “That’s enough for to-day. I think you had just a shade the better of it, old chap. Now let’s cool off in the canoe. You know what’s on the programme this afternoon.”

“I should say I did,” answered Bob; “and I’ll be hungry enough for it by the time things are ready.”

They carried their canoe down to the shore, and in a moment were paddling down the island toward the narrows. But they were not destined to go alone. Turning a point of ledge some little distance below Harvey’s camp, they came all at once upon Arthur and Joe Warren, walking along the beach.

“Take us in there, Tom,” cried Joe.

“I can take one of you,” answered Tom, pointing the canoe inshore with a turn of his paddle.

Arthur caught the end of the canoe as it came up alongside a ledge on which the boys stood, and steadied the frail craft.

“Might as well let us both in,” he said. “The more the merrier.”

“The more the riskier, too,” said Tom; “but if you fellows will take the chance of a ducking, I’m willing. Water won’t spoil anything I’ve got on. Climb in easy, now, and sit cross-legged, so if we tip over you’ll slide out head-first, clear of the thwarts.”