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Rh them up. Somebody is bound to lose in the end, and usually it's the honest person who finds out that the money is bad and won't pass it any further. The crooked ones will just try to get rid of it as quickly as they can."

When they reached home Frank told his father about Pollie Shaw and handed over the counterfeit bill.

"So they're dealing in fifties now!" exclaimed Fenton Hardy, as he looked at the money.

"Do you think it's made by the people who turned out that bad five that we got stung on?" Joe asked.

Mr. Hardy drew a magnifying glass from his vest pocket and make a close scrutiny of the bill. "It seems to have been printed on the same press but I'm not sure," he announced at last. "These things are so cleverly done that it would take an expert to notice any differences." He proceeded then to examine the five dollar bill, comparing it closely with the fifty, and at last he put the glass back into his pocket.

"I'm practically certain that these bills were issued from the same press. The paper seems to be of the same kind, just a shade lighter than the paper used in genuine money, and there are certain little differences in the engraving that are almost identical on each bill. Miss