"Cut out the scrapping, you fellows," advised Frank. "You waste more time talking about things you don't know anything about than any fellows I know."

"There are others," Bob came back at him. "Who was it that was talking a little while ago about prairie schooners?"

Sammy opened his mouth to laugh at this, but regretted it the next moment when Frank sent a dash of salt water full in his face. Sammy choked and spluttered and Frank laughed uproariously. But the laugh stopped suddenly, for Bob, who had dived behind him, had caught his legs, and the next instant Frank, too, was swallowing his fill.

There was a good-natured scuffling when he got back again to the surface, and then they came back to Sammy's suggestion to swim out to where the framework of a ship's hull showed above the rocks in which it had been wedged many years before.

"Isn't it a pretty long swim?" asked Frank a little doubtfully.

"It would be if we had to swim all the way," agreed Bob. "But we can wade out a good piece before it gets so deep we'll have to swim."

"I'd like to take a look at the old ship," said Sammy. "Who knows what we might find? I'd made up my mind, anyway, to go out there before the Summer was over. But if we're going away so soon, this may be our last chance. The water may be too rough for us to come in again to-morrow."

It seemed an easy enough swim, and as they had never been expressly forbidden to visit the old wreck they decided to do as Sammy wanted.

They found they could wade for fully a third of the way. Then the water got so deep that they had to swim.

Sammy and Frank were a little in advance when suddenly they heard a frightened shout from Bob.