BARON D'HAUTREC'S HEIRS were obliged to benefit by this great advertisement. They arranged an exhibition of the furniture and personal effects in the Avenue Henri-Martin, in the house itself, on the scene of the crime, prior to the sale at the Salle Drouot. The furniture was modern and in indifferent taste, the knicknacks had no artistic value ... but, in the middle of the bedroom, on a stand covered with ruby velvet, the ring with the blue diamond sparkled under a glass shade, closely watched by two detectives. It was a magnificent diamond of enormous size and incomparable purity and of that undefined blue which clear water takes from the sky which it reflects, the blue which we can just suspect in newly-washed linen. People admired it, went into raptures over it ... and cast terrified g