Delia was setting bread that night in the kitchen, and Maggie was reading a ghost story from the evening paper. There was a fine sifting of flour over the table, and it gave me my idea. When I went up to bed that night, I left a powdering of flour here and there on the lower floor, at the door into the library, a patch by the table, and--going back rather uneasily--one near the telephone. I was up and downstairs before Maggie the next morning. The patches showed trampling. In the doorway they were almost obliterated, as by the trailing of a garment over them, but by the fireplace there were two prints quite distinct. I knew when I saw them that I had expected the marks of Miss Emily's tiny foot, although I had not admitted it before. But these were not Miss Emily's. They were large, flat, substantial, and one showed a curious marking around the edge that--It was my own! The marking was the knitted side of my bedroom slipper. I had, so far as I could tell, gone downstairs, in the night, investigated the candles, possibly in darkness, and gone back to bed again. The effect of the discovery on me was--well undermining. In all the uneasiness of the past few weeks I had at least had full confidence in myself. And now that was gone. I began to wonder how much of the things that had troubled me were real, and how many I had made for myself. To tell the truth, by that time the tension was almost unbearable. My nerves were going, and there was no reason for it. I kept telling myself that. In the mirror I looked white and anxious, and I had a sense of approaching trouble. I caught Maggie watching me, too, and on the seventh I find in my journal the words: "Insanity is often only a formless terror." On the Sunday morning following that I found three burnt matches in the library fireplace, and one of the candles in the brass holders was almost gone. I sat most of the day in that room, wondering what would happen to me if I lost my mind. I knew that Maggie was watching me, and I made one of those absurd hypotheses to myself that we all do at times. If any of the family came, I would know that she had sent for them, and that I was really deranged! It had been a long day, with a steady summer rain that had not cooled the earth, but only set it steaming. The air was like hot vapor, and my hair clung to my moist forehead. At about four o'clock Maggie started chasing a fly with a folded newspaper. She followed it about the lower floor from room to room, making little harsh noises in her throat when she missed it. The sound of the soft thud of the paper on walls and furniture seemed suddenly more than I could bear. "For heaven's sake!" I cried. "Stop that noise, Maggie." I felt as though my eyes were starting from my head. "It's a fly," she said doggedly, and aimed another blow at it. "If I don't kill it, we'll have a million. There, it's on the mantel now. I never--"