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2 ble result, when, one day, notice was received at Washington that a number of suspicious-looking letters, addressed to the simple initials, X. Y. Z., Brandon, Mass., were being daily forwarded through the mails of that region; and it being deemed possible that a clue had at last been offered to the mystery in hand, I was sent northward to investigate.

It was in the middle of June, 1881, and the weather was simply delightful. As I stepped from the cars at Brandon and looked up the long straight street with its double row of maple trees sparkling fresh and beautiful in the noonday sun, I thought I had never seen a prettier village or entered upon any enterprise with a lighter or more hopeful heart.

Intent on my task, I went straight to the post-office, and after coming to an understanding with the postmaster, proceeded at once to look over the mail addressed to the mysterious X. Y. Z.

I found it to consist entirely of letters. They were about a dozen in number, and were, with one exception, similar in general appearance and manner of direction, though inscribed in