It would require a volume to relate the incidents connected with the exploits of the Detective Corps of New York. Sometimes the search for a criminal is swift and short, and the guilty parties are utterly confounded by the suddenness of their detection and apprehension. Sometimes the search is long and toilsome, involving the greatest personal danger, and abounding in romance and adventure. Some of the best established incidents of this kind would be regarded simply as Munchausen stories, were they related without the authority upon which they rest. Such adventures are well known to the reading public, and I pass them by here. But the Detectives are not always successful in their efforts. If they are ingenious and full of resource, the criminals they seek are equally so, and they find their best efforts foiled and brought to naught by the skill of this class in "covering up their tracks." To my mind the most interesting cases are not those in which the Detective's labors have been crowned with success, but those in which he has been baffled and perplexed at every step, and which to-day remain as deeply shrouded in mystery as at the time of their occurrence. Inspector James Leonard, in the spring of 1869, related the following case to Mr. Edward Crapsey, in whose words it is presented here: "One spring morning, during the first year of the war, a barrel of pitch was found to have disappeared from a Jersey City pier, and the porter in charge, when reporting the fact to his employers, took occasion to speak of the river-thieves in no very complimentary terms. "On the same day, Ada Ricard, a woman of nomadic habits and dubious status, but of marvellous beauty, suddenly left her hotel in New York, without taking the trouble to announce her departure or state her destination. The clerks of the house only remarked that some women had queer ways. "A few days after these simultaneous events, the same porter who had mourned the lost pitch, happening to look down from the end of his pier when the tide was out, saw a small and shapely human foot protruding above the waters of the North River. It was a singular circumstance, for the bodies of the drowned never float in such fashion; but the porter, not stopping to speculate upon it, procured the necessary assistance, and proceeded to land the body. It came up unusually heavy, and when at last brought to the surface, was found to be made fast by a rope around the waist to the missing barrel of pitch. There was a gag securely fastened in the mouth, and these two circumstances were positive evidence that murder had been done.