Little by little the dentist's attention seemed to wander away from his guest. He wheeled his chair round, and sat looking at the fire with the same fixed gloom upon his face which had darkened it on the night of his return from Yorkshire. Things had been so desperate with him of late, that he had lost his old orderly habit of thinking out a business at one sitting, and making an end of all deliberation and hesitation about it. There were subjects that forced themselves upon his thoughts, and certain ideas which repeated themselves with a stupid persistence. He was such an eminently practical man, that this disorder of his brain troubled him more even than the thoughts that made the disorder. He sat in the same attitude for a long while, scarcely conscious of Mrs. Halliday's presence, not at all conscious of the progress of time. Georgy had been right in her gloomy forebodings of bad behaviour on the part of Mr. Halliday. It was nearly one o'clock when a loud double knock announced that gentleman's return. The wind had been howling drearily, and a sharp, slanting rain had been pattering against the windows for the last half-hour, while Mrs. Halliday's breast had been racked by the contending emotions of anxiety and indignation. "I suppose he couldn't get a cab," she exclaimed, as the knock startled her from her listening attitude--for however intently a midnight watcher may be listening for the returning wanderer's knock, it is not the less startling when it comes. "And he has walked home through the wet, and now he'll have a violent cold, I daresay," added Georgy peevishly. "Then it's lucky for him he's in a doctor's house," answered Mr. Sheldon, with a smile. He was a handsome man, no doubt, according to the popular idea of masculine perfection, but he had not a pleasant smile. "I went through the regular routine, you know, and am as well able to see a patient safely through a cold or fever as I am to make him a set of teeth."