The boy Fletcher was at first supposed to be the only person concerned in the affair; but the investigation developed the facts above stated, and Barrett, who had suddenly left for New York, was arrested at Genesee on the 9th of June. On the 16th he was taken to Williamsport, Pennsylvania, where the United States District Court was held; on the 17th he was put on trial; on the 18th found guilty; and on the 20th he was lodged in the Western Penitentiary at Alleghany City, Pennsylvania, the court having sentenced him to three years’ imprisonment. Barrett’s age was fifty-six, which influenced the court in shortening the term of imprisonment. The principal witness against Barrett was young Fletcher. A large number of letters was found at a place designated by him. One hundred and sixty dollars and other mailable matter were found where he said they were concealed. The most important item of testimony, however, was that which related to a silver half-dollar, which Fletcher alleged he had taken out of a letter, and which he had sold to Barrett for sixty cents in currency. It was ascertained that a drafted man, on leaving for the army, had taken inadvertently with him a half-dollar belonging to his little son. At the time the tampering was going on with letters at the post-office, he had enclosed a half-dollar in a letter to his wife to replace the one he had taken away with him. This letter had to pass through the Jackson office, but it never reached its destination. Doubtless this was the one out of which Fletcher got the half-dollar sold to Barrett. It is a curious fact in the history of criminals that their detection, in nine cases out of ten, is caused by some very trifling incident connected with the operations. So it was in this case. The 126th section of the act of Congress of March 3, 1825, makes the opening, embezzling, or destroying of mail-letters or packages containing articles of value an offence punishable with imprisonment not less than two, nor more than ten, years. The 129th section of the same act provides “That every person who, from and after the passage of this act, shall procure and advise, or assist, in the doing or perpetration of any of the acts or crimes by this act forbidden, shall be subject to the same penalties and punishments as the persons are subject to who shall actually do or perpetrate any of the said acts or crimes, according to the provisions of this act.” It was under this clause Barrett was convicted, and it is, perhaps, the only case of the kind on record.