He sat listening. He heard the servant answer the door, and waited for her feet on the staircase, but she did not come. "Wonder what that was," said Doctor Kemp.
He tried to resume his work, failed, got up, went downstairs from his study to the landing, rang, and called over the balustrade to the housemaid as she appeared in the hall below. "Was that a letter?" he asked.
"Only a runaway ring, sir," she answered.
"I'm restless to-night," he said to himself. He went back to his study, and this time attacked his work resolutely. In a little while he was hard at work again, and the only sounds in the room were the ticking of the clock and the subdued shrillness of his quill, hurrying in the very centre of the circle of light his lamp-shade threw on his table.
It was two o'clock before Doctor Kemp had finished his work for the night. He rose, yawned, and went downstairs to bed. He had already removed his coat and vest, when he noticed that he was thirsty. He took a candle and went down to the dining-room in search of a syphon and whiskey.
Doctor Kemp's scientific pursuits had made him a very observant man, and as he recrossed the hall, he noticed a dark spot on the linoleum near the mat at the foot of the stairs. He went on upstairs, and then it suddenly occurred to him to ask himself what the spot on the linoleum might be. Apparently some sub-conscious element was at work. At any rate, he turned with his burden, went back to the hall, put down the syphon and whiskey, and bending down,
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