An important question now arose, namely, what postmaster between these points used wafers similar to those upon the rifled letters. Having entire confidence in the Ogdensburg post master, I requested him to write to each of the post masters on the suspected route, asking for information on indifferent subjects and requiring replies. One was requested to send a copy of the post-bill from his office to Ogdensburg of a certain date. Another was inquired of to know whether a letter remained in his office addressed to Timothy Saunders; another to know whether there was once a clerk in his office by the name of Philip Barton, and if so, where he was at present residing. In this way letters were obtained from all these post masters in the course of a few days, and the mode of sealing was in each case particularly examined. Upon one of these letters the large wafer was found! There was not only the kind of wafer, but the stamp identical with that used upon the rifled letters. For a few days after this, the exterior of all the letters received at Ogdensburg, and which passed through the suspected office, were carefully examined to see if they had been disturbed. This examination showed plainly that a number had been opened, and resealed either with the large wafer, or by the use of the original seals, which of course were mutilated. Careful inquiry of some who knew the suspected post master, showed that he was a merchant in good standing, against whom no charge of dishonesty had ever been preferred. The next thing to be done was to visit a point beyond him, in order to pass decoy letters through his hands, on their way to the Ogdensburg office. Accompanied by a citizen of Ogdensburg, whose services I had secured as a guide, I started in a private conveyance, and when we had arrived within ten miles of the office of the big wafers, we turned into a by-road so as to avoid passing through the village in which it was situated. At a short distance from the village upon the road aforesaid, we saw a sleigh approaching, (it was the month of December, and capital sleighing,) and as it drew near, my companion remarked that he believed its occupant was Mr. Willis, the very person we were endeavoring to avoid! My friend knew Mr. W. by sight, but was not sure that Mr. W. knew _him_. We concealed our faces as well as we could under the circumstances, and passed at as rapid a rate as was compatible with the muscular powers of our Rosinante. It afterwards appeared that Willis was out on a collecting tour that day, and that neither of us were known to him, nor had he the least suspicion of our business. The mail which had so frequently suffered the loss of its valuable contents, passed over the route in the night, leaving Fort Covington at about ten P. M. and reaching the suspected office a little before midnight.