It was now fully night-fall, and a thick humid fog hung over the city, soon ending in a settled and heavy rain. This change of weather had an odd effect upon the crowd, the whole of which was at once put into new commotion, and overshadowed by a world of umbrellas. The waver, the jostle, and the hum increased in a tenfold degree. For my own part I did not much regard the rain—the lurking of an old fever in my system rendering the moisture somewhat too dangerously pleasant. Tying a handkerchief about my mouth, I kept on. For half an hour the old man held his way with difficulty along the great thoroughfare; and I here walked close at his elbow through fear of losing sight of him. Never once turning his head to look back, he did not observe me. By and by he passed into a cross street, which, although densely filled with people, was not quite so much thronged as the main one he had quitted. Here a change in his demeanor became evident. He walked more slowly and with less object than before—more hesitatingly. He crossed and re-crossed the way repeatedly without apparent aim; and the press was still so thick that, at every such movement, I was obliged to follow him closely. The street was a narrow and long one, and his course lay within it for nearly an hour, during which the passengers had gradually diminished to about that number which is ordinarily seen at noon in Broadway near the park—so vast a difference is there between a London populace and that of the most frequented American city. A second turn brought us into a square, brilliantly lighted, and overflowing with life. The old manner of the stranger re-appeared. His chin fell upon his breast, while his eyes rolled wildly from under his knit brows, in every direction, upon those who hemmed him in. He urged his way steadily and perseveringly. I was surprised, however, to find, upon his having made the circuit of the square, that he turned and retraced his steps. Still more was I astonished to see him repeat the same walk several times—once nearly detecting me as he came round with a sudden movement.