“As to the mark of the hand on the wall, that had evidently been made during the first phase—when the murderer was really there. All the traces of his presence had naturally been left during the first phase; the mutton-bone, the black footprints, the Basque cap, the handkerchief, the blood on the wall, on the door, and on the floor. If those traces were still all there, they showed that Mademoiselle Stangerson—who desired that nothing should be known—had not yet had time to clear them away. This led me to the conclusion that the two phases had taken place one shortly after the other. She had not had the opportunity, after leaving her room and going back to the laboratory to her father, to get back again to her room and put it in order. Her father was all the time with her, working. So that after the first phase she did not re-enter her chamber till midnight. Daddy Jacques was there at ten o’clock, as he was every night; but he went in merely to close the blinds and light the night-light. Owing to her disturbed state of mind she had forgotten that Daddy Jacques would go into her room and had begged him not to trouble himself. All this was set forth in the article in the ‘Matin.’ Daddy Jacques did go, however, and, in the dim light of the room, saw nothing. “Mademoiselle Stangerson must have lived some anxious moments while Daddy Jacques was absent; but I think she was not aware that so many evidences had been left. After she had been attacked she had only time to hide the traces of the man’s fingers on her neck and to hurry to the laboratory. Had she known of the bone, the cap, and the handkerchief, she would have made away with them after she had gone back to her chamber at midnight. She did not see them, and undressed by the uncertain glimmer of the night light. She went to bed, worn-out by anxiety and fear—a fear that had made her remain in the laboratory as late as possible.