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Rh might slip on the icy path and be injured. If your knife had only been found lying on top of the ice I might think you had come up merely to look at the big ball, and had dropped your property there. But the knife was found frozen fast, showing that it must have been dropped during the time the water was poured on the steps. So you see whoever left it there must have been on hand when the trick was played."

"That may be true, Mr. Tetlow!" cried Bert, "but I did not leave my knife there. I remember now—I can explain it! I couldn't think, at first, but I see it now."

"Very well," said Mr. Tetlow quietly, "I'll hear what you have to say, Bert."