“This, Monsieur President,” he said, “is a hair—a blond hair stained with blood;—it is a hair from the head of Mademoiselle Stangerson. I found it sticking to one of the corners of the overturned table. The corner of the table was itself stained with blood—a tiny stain—hardly visible; but it told me that, on rising from her bed, Mademoiselle Stangerson had fallen heavily and had struck her head on the corner of its marble top. “I had still to learn, in addition to the name of the assassin, which I did later, the time of the original attack. I learned this from the examination of Mademoiselle Stangerson and her father, though the answers given by the former were well calculated to deceive the examining magistrate. Mademoiselle Stangerson had stated very minutely how she had spent the whole of her time that day. We established the fact that the murderer had introduced himself into the pavilion between five and six o’clock. At a quarter past six the professor and his daughter had resumed their work. At five the professor had been with his daughter, and since the attack took place in the professor’s absence from his daughter, I had to find out just when he left her. The professor had stated that at the time when he and his daughter were about to re-enter the laboratory he was met by the keeper and held in conversation about the cutting of some wood and the poachers. Mademoiselle Stangerson was not with him then since the professor said: ‘I left the keeper and rejoined my daughter who was at work in the laboratory.’ “It was during that short interval of time that the tragedy took place. That is certain. In my mind’s eye I saw Mademoiselle Stangerson re-enter the pavilion, go to her room to take off her hat, and find herself faced by the murderer. He had been in the pavilion for some time waiting for her. He had arranged to pass the whole night there. He had taken off Daddy Jacques’s boots; he had removed the papers from the cabinet; and had then slipped under the bed. Finding the time long, he had risen, gone again into the laboratory, then into the vestibule, looked into the garden, and had seen, coming towards the pavilion, Mademoiselle Stangerson—alone. He would never have dared to attack her at that hour, if he had not found her alone. His mind was made up. He would be more at ease alone with Mademoiselle Stangerson in the pavilion, than he would have been in the middle of the night, with Daddy Jacques sleeping in the attic. So he shut the vestibule window. That explains why neither Monsieur Stangerson, nor the keeper, who were at some distance from the pavilion, had heard the revolver shot.