"We were goin' to dig clams," added Mun Bun.

"But we couldn't find any," continued Margy. "And then when we went to wade back home the water got deep and we were afraid."

"I should think you would be!" replied the lobster fisherman. "Well, I'm glad I heard you call. It wouldn't be very nice on your island now."

The children looked back. Their island was out of sight. It was "submerged," as a sailor would say, meaning that it was under the water. For the tide had risen and covered it.

"Will you take us home?" asked Margy.

"That's what I will," said the lobster fisherman. "I'll take you right up to Mr. Bunker's pier. I guess your folks don't know where you are, nor what trouble you might have been in if I hadn't come along just when I did."

And this was true, for neither Daddy nor Mother Bunker, nor Cousin Tom nor his wife, nor any of the other little Bunkers had heard the cries of Mun Bun and Margy.

But as the motor-boat went puffing up to the little wharf the noise it made was heard by Mr. and Mrs. Bunker, who ran down from the cottage to see it, as they wanted to buy a fresh lobster and they had been told that Mr. Burnett might soon come back from having gone to lift his pots.

"Well, I had pretty good luck to-day," said the old fisherman, as he stopped his boat at the pier, and pointed to Margy and Mun Bun. "See what I caught!"

"Margy!" cried her mother, in great surprise.