Twice only had he shown himself, and then, after a grave bow to Marcus Wilkeson, who returned it with more than the usual inclination of head, the old gentleman had taken a few whiffs at his pipe, looked out of the window with a troubled air, and vanished from the sight of his sympathizing observer, as if the quiet old sitting place had lost its charm for him. The young man--the disturbing element of the old gentleman's life, as Marcus Wilkeson regarded him--was not again seen in the room where he had made his first appearance, but was discovered, several days after that event, sitting at a table near a window in the second story, and writing industriously. His labors were evidently not disagreeable; for, after an hour's engagement with his pen, he would sit back in his chair, laugh, take a long drink from a black bottle which stood at his elbow, and light a fresh cigar. Whatever his occupation, he was completely absorbed in it, and did not notice the pair of keen eyes peering at him from behind a book in the house opposite. Every afternoon, about three o'clock, the young man sat at the table with his bottle, cigars, and writing materials, and pursued his pleasant labors. Marcus Wilkeson would never have pretended that it was not highly improper to watch one's neighbors. He would have denounced it as deserving of the severest reprobation. But he would have said, that if, while he was sitting, according to his invariable custom, at his own window, for the sole purpose of reading a book, people chose to bring themselves within the range of his vision, he was not therefore under obligations to vacate his seat. He would have insisted that any glances which he might have directed at his neighbors, were so levelled in fits of mental abstraction, or in the exercise of a friendly regard for them. The Overtop theory he discarded as fallacious, and likely to get its talented founder into trouble. That founder and his only follower, Maltboy, were determined, however, to put the new social system into practice on New Year's day, and had secured the ready services of Quigg, the grocer, as originally proposed by the sagacious Overtop. Marcus Wilkeson obstinately refused to participate in this projected grand tour; which refusal was too bad, said Overtop, because the fourth seat in the double sleigh that had been hired for the occasion would be left vacant. At last came New Year's day; and the sky was cloudless, and the sun was bright, and the weather was just cold enough to make the blood tingle pleasantly, and the snow was a foot deep, and well beaten down in the side streets. The elements themselves had conspired to give the Overtop theory every chance of success.