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 that this man White had a machine shop in the city.

They did not at once undertake to interview White.

They shadowed the machine shop until they had an opportunity to get very careful observations of White. They had little data to go on, but they thought he was about the size of one of the bandits described by the mail clerks.

They examined the names attached to the note and finally determined they had been made with a rubber stamp. They, then, interviewed all the local stamp dealers, but could find no one who had any knowledge of such a stamp.

However, they remained in the city and continued to shadow White.

They followed him from place to place, and wherever he made purchases they would go in after him and demand of the storekeeper the note which White had passed, giving another in place of it. They would, then, have the person from whom they had obtained the note write his name on it so that it could later be identified as having been received from this man White.

In this manner they finally got a number of bills bearing the serial numbers of the notes which had been taken in the train robbery. But this was all the evidence they were able to obtain.