It did not seem very probable that any one should have so intimate a knowledge of the designs of the villains as he appeared to possess, without being, to some extent at least, involved in their guilt. Notwithstanding their suspicions, the officers of the road concluded to engage his services, with the intention of keeping a sharp lookout upon him. He gave the names of several persons as concerned in the scheme, and proposed to correspond with some of the leaders and draw from them disclosures which would cause their detection. About this time he went to work in a printing office, and was observed to be irregular in his habits, being much out at nights. He had occasional interviews with Mr. S. (one of the Attorneys above mentioned,) rather respecting what he had _not_ discovered than what he had, and sometimes showing letters that he pretended to have received, threatening his life unless he left the country. These interviews, however unfruitful they were in available information, led to a result which was not anticipated by the cunning B. Had this individual narrowly observed all the surroundings of the lawyer's office, he would have seen a quantity of fresh damp sand strewed upon the walk in front, through which he was obliged to pass on entering. Of course he thought nothing of it; hardly any one would; but the impressions which his boots made on that sand were found to correspond exactly with those obtained from the clay at the scene of the railroad accident before mentioned! One evening, about three weeks after the accident on the railroad, B. rushed into the office of the railroad company in breathless haste, and informed the Assistant Superintendent that he had been applied to by a certain person to put obstructions on the track a little West of the city, to catch the 9 P. M. mail train West; but had got away from him and hurried to the office to give this information. The Assistant Superintendent and others immediately went up the road about two miles, and found obstructions placed in the spot indicated, and removed them. When the train passed, the light in front of the locomotive showed several men running into the woods. This was the third instance of attempted obstruction to the mail trains upon this road, within less than a month (one having occurred previously to that first mentioned, causing, however, but slight damage,) and it was ascertained that there were considerable amounts of money in the mail on each of those occasions. It may be remarked in passing, that although B. had notified the company in advance, of actual obstructions, and had given the names of the parties concerned, yet no progress seemed to be made in detecting the guilty individuals. It was evidently his policy to obtain money from the company as the price of his disclosure, and yet to manage so that no discovery would result.