At the time of the murder, the only inmates of the house were Washington and Frederick Nathan, sons of the dead man, and Mrs. Kelly, the housekeeper, and her grown son, William Kelly. Had the murder been committed by any of these they must of necessity have stolen the missing articles, and as they had not left the house, must have destroyed or concealed them on the premises. Without the knowledge of these persons, Jourdan caused a rigid and thorough search of the house and lot to be made from cellar to garret. Every crack and crevice, every nook and corner was rigidly and minutely searched by experienced persons. Even the furniture and carpets were examined, the flooring of the stable was taken up, the water-tank was emptied, the basins, closets, and waste-pipes of the house were flushed, and the street-sewers were examined for a long distance from the house, but no trace of the missing articles could be found; nor could any mark of the "dog" be discovered anywhere save on the body of the victim. One by one, the inmates of the house were subjected to the most searching cross-examination, and within six hours after the discovery of the deed, Captain Jourdan was satisfied that the inmates of the mansion were entirely innocent of the crime. The evidence drawn out by the inquest subsequently confirmed the innocence of these parties. The only clew left by the assassin was the "dog." At the inquest, the policeman on the beat swore that when he passed the house on his rounds at half-past four A.M., he tried both front doors, and that they were fastened, and that when he passed again a little before six o'clock, he noticed that the hall-door was closed. Another witness testified that about five o'clock, a man in a laborer's dress, carrying a dinner-pail, ascended the steps of the Nathan mansion, picked up a paper from the topmost step, and passed on down the street. The introduction of this man in the laborer's dress but deepened the mystery and increased the labors of the Detectives.