Mun Bun and his little sister did as their father told them, and sat down in the middle of the boat.
"Now we'll get them all right," said Mr. Bunker to his wife. "Don't worry—they will be all right."
Cousin Tom ran out on the end of his pier. He waved his hands to the man in the motor-boat, who was a lobster fisherman, going out to "lift" his pots.
"Wait a minute!" called Cousin Tom. "Two children are adrift in that boat. We want to go after them!"
The lobster fisherman waved his hand to show that he understood. The motor of his boat was making such a noise that he could not make his voice heard, nor could he tell what Cousin Tom was saying. But he knew what was meant, for he saw the drifting boat.
With another wave of his hand to show that he knew what was wanted of him, the lobsterman steered his boat toward Cousin Tom's wharf. A few minutes later Daddy Bunker and Cousin Tom were in it, and were speeding down Clam River after the drifting craft in which sat Margy and Mun Bun.
"How did it happen?" asked Mr. Oscar Burnett, the lobster fisherman, as he steered his boat down stream.
"I don't know," answered Daddy Bunker "All I know is my wife called to me to come out, and I saw the two tots drifting off in the boat."
"They must have climbed in to play when the boat was tied to the wharf," said Cousin Tom. "Then either they or some one else must have loosened the rope."
"Maybe it came loose of itself," suggested Daddy Bunker.