"A man came into the Fourth Police Precinct, some time ago, and complained that his house had been robbed. The thief had been pursued without effect, but while running, he was observed to drop a chisel, and to tear up a piece of paper, which he also threw away. Captain Thorn, and a detective who was present, carefully examined the man respecting the mode by which the entrance had been effected, the marks left by the tools, the kind of property taken, and the action and bearing of the thief while running away. After eliciting all the facts that they could obtain, they both agreed that it had been done by a certain gang. When this had been ascertained to their satisfaction, the next thing to be done was to identify the individual or individuals belonging to the said gang, who had committed the robbery. Captain Thorn proceeded to gum over a piece of paper, on which he fitted together the small bits of paper which the thief had thrown away. This at once disclosed the name of the robber, who was well known to the police as a member of the gang which Captain Thorn and the detective had, from the indications afforded, judged to be the depredators. The detective then said that the thief would certainly be found at one of three places which he named. Three policemen were accordingly sent after him, one to each of the places named; and the captain assured us that the sun was not more certain to rise the next morning, than that the man would be at the station-house. Now, how were the police enabled to fix so readily on the depredators in this case? Simply by their intimate knowledge of their style of working. They knew their marks just as a man knows the handwriting of his correspondent. When they had fixed upon the man who committed the robbery, their knowledge of all his habits enabled them to predict with certainty where he would be found, and to give such exact description of his person as would enable any one who had never seen him to recognize him at a glance." A COSTLY CASE.