two o'clock before
`` 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 lampshade threw on his table . It was two o'clock before Dr. 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 .