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BOBBSEY TWINS ON A HOUSEBOAT

small attention to her, for Dinah was often forgetful, and might have been mistaken.

"I really think we have some rats aboard," said Mr. Bobbsey. "There are some on nearly every boat. I have heard noises in the night that could be made only by rats."

"And Snap still acts queerly, whenever he passes that locker," said Mrs. Bobbsey. "I'm not so sure it is a rat that made that noise, Richard."

"No?" her husband asked. "What was it, then?"

But Mrs. Bobbsey either could not, or would not, say.

"I say, Harry," said Bert to his country cousin one day, when the Bluebird had come to anchor some distance down the lake, "let's try to get to the bottom of this mystery."

"What mystery?"

"Why, the one about the noise, and the sandwiches and cakes being taken, and Snap acting so funny. I'm sure there's a mystery on this boat, and we ought to find out what it is."