My object in sending this second missive was to prevent any suspicion that otherwise might arise in regard to the money-letter. For it might reasonably be presumed that the accused post master would be on the watch for anything that could by any possibility compromise him; and a solitary letter containing funds, passing through his office, might "give him pause," in case he should have any desire to appropriate its contents. Both letters were directed to Rouse's Point, N. Y., regularly post-marked at the Boston post-office, and the post bill also made out for Rouse's Point. But on the outside wrapper was purposely written the name of the office which I wished to test. This would excite no suspicion, for mistakes such as this appeared to be, do sometimes occur in the hurry of making up the mails. Instead of putting the package into the mail, however, I conveyed it myself to a point near the town of H., and saw it placed in the pouch just before it reached that office. The question now to be settled was, whether on taking off the wrapper (marked "H." as the reader will remember,) and finding the enclosed letters directed to another place, he would forward them to their address, as was his duty, or would appropriate them to himself, believing that they had come there in consequence of a mere accident, and that if he should see fit to take possession of them, the circumstances of the case would effectually conceal his crime, and render search unavailing. It may be said that this was carrying temptation too far. By no means. What degree of integrity should be reasonably required, let me ask, of a person in the service of the public, occupying a responsible position like that of a post master? upon whose fidelity depend the prompt and safe transaction of business, and the security of many other interests of social life. Will a valetudinarian virtue answer the purpose? a virtue strong against weak temptations, but weak against strong ones? The man whose principles cannot withstand every degree of enticement to dishonesty, is unfit for any place of trust. Furthermore, the combination of circumstances which I have just described, might occur in the experience of any post master throughout the country, and the sufferers by the unfaithfulness of an official so tempted, would hardly be satisfied with being told that he could have resisted any ordinary enticement, but that such an opportunity was too good to be lost. It should be borne in mind that up to this time, the party whose character was involved in these investigations and experiments, was totally unaware of the visits of the Agent to his neighborhood.