I propose here to relate some details, which may be interesting, of the means taken to "narrow down" and trace out those extensive robberies, not so much on account of anything novel or original, adopted at this or any other stage of the investigation, as to demonstrate the value of a character that is proof against trying temptation; and the dangerous position of those who are not at all times thus fortified, although they may be innocent of the particular offences charged. With but few exceptions, the mails in which the missing letters and money packages should have been conveyed to New York, would have come from the East by the express night trains, over the Boston and New York Railroad. Upon those trains, the mails were in charge of the baggage-masters, the regular mail or "route agents" being confined to the way mail-trains running at different hours of the day. A variety of circumstances, besides their good reputation, conspired to avert suspicion from these baggage-men. The mails were in "through bags," and it required a mail-key to obtain access to their contents; and besides, the robberies could not well be perpetrated in that way without collusion between several persons,--the express agents, and the conductors, all reliable men, having occasion often to visit the baggage car, which was always well lighted. Accompanying the night express trains there were also "through baggage-masters," so called. Their duty was performed by two persons, one of whom left Boston and the other New York on each evening. On privately consulting the officers of the railroad company as to the running of these men, it appeared that about all the losses had happened on the nights of one of them: a discovery which, as had been shown by experience in similar cases, was by no means conclusive, and yet of too much importance to be overlooked. The individual thus involved knew me well, and it required no little manoeuvring to get over the route as often as was necessary, without being observed by him. One night when thus endeavoring to avoid him, a very amusing incident occurred. The regular conductor soon after leaving Springfield, was taken suddenly ill, and procured the services of this identical baggage-master for a short distance, unknown of course to me. I was sitting curled up in the corner of the saloon of the first passenger car, when the door opened and the well known call of "Tickets, gentlemen," apprised me that he had found me out before I had recognised him, or at least had discovered that I was "aboard." But I made the best of it, simply remarking that there was the least dust there of any spot on the train. Up to this time my ground of suspicion was mainly confined to the coincidence already mentioned between the dates of losses, and his presence on the cars. The investigation had not proceeded far, however, when another matter came to light, which increased suspicion in that quarter.