"Dec. 26. Mitchel arose early, and called for Miss Remsen at eleven o'clock. Together they went to the home of Mr. and Mrs. Van Rawlston, at Fifth Avenue near Forty-eighth Street. They remained nearly an hour, and then separated when they came out. Mitchel eat luncheon at the Brunswick, where he was joined by Thauret. They went to the club in the afternoon and played whist. They lost money. Mitchel paid for both, and took an I.O.U. from Thauret for his share. Randolph was in the game. There is a growing coolness between Randolph and Mitchel. They barely speak when they meet. It is evident that no love is lost between Randolph and Thauret. In the evening the three men were in the Remsens' box at the opera. S----. "Miss Remsen accompanied Mitchel to Mrs. Van Rawlston's in the morning, and left him when they came out. She made several calls mainly upon well-known fashionable society leaders. Something is evidently on the _tapis_. It occurred to me that the missing child might have been placed in the care of the Van Rawlstons. Therefore in the afternoon I allowed R---- to follow the young ladies on a shopping expedition, whilst I interviewed the policeman on the beat. He is acquainted with the Van Rawlston's maid, and will send a report to you to-night. The ladies went to the opera in the evening. W----. "Mr. and Mrs. Van Rawlston have three children, all younger than fourteen, and only one a girl, the youngest. The Miss Remsen who called was a Miss Emily Remsen. She was accompanied by a Mr. Robert Mitchel. They came to beg Mrs. Van Rawlston to allow a society to which the young lady belongs, to give an entertainment in her house. The entertainment is to be New Year's night. Policeman 1666. "Dec. 23. Mitchel and Thauret went to a costumer's on Union Square. When they had left I called there and said that I was a friend of Mr. Mitchel's and wished a costume made for the same entertainment. The plan worked, and by adroit questioning I discovered that there is to be an Arabian Night festival on the night of the New Year. It is to be a costume masquerade, and Mitchel has promised to send all of the men to his costumer for their dresses. He ordered an Ali Baba dress. Thauret left no order, saying he would not attend. I ordered an Aladdin costume. If you do not decide to attend I can countermand the order, but I thought you might find it advantageous to be present. With Aladdin's wonderful lamp you might shed some light upon the mystery. Pardon the joke. The afternoon and evening were spent by Mitchel and Thauret at their club. Again they played whist and again they lost. S----.