A great crime that altogether baffled the New York police occurred in 1870, and is still remembered as an extraordinary mystery. It was the murder of a wealthy Jew named Nathan, in his own house in Twenty-third Street. He had come up from the country in July for a religious ceremony, and slept at home. His two sons, who were in business, also lived in the Twenty-third Street house. The only other occupant was a housekeeper. The sons, returning late, one after the other, looked in on their father and found him sleeping peacefully. No noise disturbed the house during the night, but early next morning Mr. Nathan was found a shapeless mass upon the floor; he had been killed with brutal violence, and the weapon used, a ship carpenter's "dog," was lying close by the body besmeared with blood and grey hairs. The dead man's pockets had been rifled, and all his money and jewellery were gone; a safe that stood in the corner of the bedroom had been forced and its contents abstracted. Various theories were started, but none led to the track of the criminal. One of Mr. Nathan's sons was suspected, but his innocence was clearly proved. Another person thought to be guilty was the son of the resident housekeeper, but that supposition also fell to the ground. Some of the police were of opinion that it was the work of an ordinary burglar; others opposed this view, on the ground that the ship carpenter's "dog" was not a housebreaking tool. One ingenious solution was offered, and it may be commended to the romantic novelist; it was to the effect that Mr. Nathan held certain documents gravely compromising the character of a person with whom he had had business dealings, and that this person had planned and executed the murder in order to become repossessed of them. This theory had no definite support from known fact; but Mr. Nathan was a close, secretive man, who kept all the threads of his financial affairs in his own hands; and it was said that no one in his family, not even his wife, was aware what his safe held or what he carried in his pockets. It is worth noticing that this last theory resembles very closely the explanation suggested as a solution of the undiscovered murder of Rupprecht in Bavaria, which has been already described. There are one or two striking cases in the records of Indian crime of murders that have remained undiscovered. Mr. Arthur Crawfurd[3] describes that of an old Marwari money-lender, which repeats in some particulars the cases of Rupprecht and Nathan. This usurer was reputed to be very wealthy. His business was extensive, all his neighbours were more or less in his debt, and, as he was a hard, unrelenting creditor, he was generally detested throughout the district.