He was roused by another exclamation from Estelle.
"It's getting light again," she said.
Arthur rose and went eagerly to the window. The darkness was becoming less intense, but in a way Arthur could hardly credit.
Far to the west, over beyond the Jersey hills—easily visible from the height at which Arthur's office was located—a faint light appeared in the sky, grew stronger and then took on a reddish tint. That, in turn, grew deeper, and at last the sun appeared, rising unconcernedly in the west.
Arthur gasped. The streets below continued to be thronged with people and motor-cars. The sun was traveling with extraordinary rapidity. It rose overhead, and as if by magic the streets were thronged with people. Every one seemed to be running at top-speed. The few teams they saw moved at a breakneck pace—backward! In spite of the suddenly topsyturvy state of affairs there seemed to be no accidents.
Arthur put his hands to his head.
"Miss Woodward," he said pathetically, "I'm afraid I've gone crazy. Do you see the same things I do?"
Estelle nodded. Her eyes wide open.
"What is the matter?" she asked helplessly.
She turned again to the window. The square was almost empty once more. The motor-cars still traveling about the streets were going so swiftly they were hardly visible. Their speed seemed to increase steadily. Soon it was almost impossible to distinguish them, and only a grayish blur marked their paths along Fifth Avenue and Twenty-Third Street.
It grew dusk, and then rapidly dark. As their office was on the western side of the building they could not see that the sun had sunk in the east, but subconsciously they realized that this must be the case.
In silence they watched the panorama grow black except for the street-lamps, remain thus for a time, and then suddenly spring into brilliantly illuminated activity.
Again this lasted for a little while, and the west once more began to glow. The sun rose somewhat more hastily from the Jersey hills and began to soar overhead, but very soon darkness fell again. With hardly an interval the city became illuminated, and then the west grew red once more.
"Apparently," said Arthur, steadying his voice with a conscious effort, "there's been a cataclysm somewhere, the direction of the earth's rotation has been reversed, and its speed immensely increased. It seems to take only about five minutes for a rotation now."
As he spoke darkness fell for the third time. Estelle turned from the window with a white face.
"What's going to happen?" she cried.
"I don't know," answered Arthur. "The scientist fellows tell us if the earth were to spin fast enough the centrifugal force would throw us all off into space. Perhaps that's what's going to happen."
Estelle sank into a chair and stared at him, appalled. There was a sudden explosion behind them. With a start, Estelle jumped to her feet and turned. A little gilt clock over her typewriter-desk lay in fragments. Arthur hastily glanced at his own watch.
"Great bombs and little cannon-balls!" he shouted. "Look at this!"
His watch trembled and quivered in his hand. The hands were going around so swiftly it was impossible to watch the minute-hand, and the hour-hand traveled like the wind.
While they looked, it made two complete revolutions. In one of them the glory of daylight had waxed, waned, and vanished. In the other, darkness reigned except for the glow from the electric light overhead.
There was a sudden tension and catch in the watch. Arthur dropped it instantly. It flew to pieces before it reached the floor.
"If you've got a watch," Arthur ordered swiftly, "stop it this instant!"
Estelle fumbled at her wrist. Arthur tore the watch from her hand and threw open the case. The machinery inside was going so swiftly it was hardly visible; Relentlessly, Arthur jabbed a penholder in the works. There was a sharp click, and the watch was still.
Arthur ran to the window. As he reached it the sun rushed up, day lasted a moment, there was darkness, and then the sun appeared again.
"Miss Woodward!" Arthur ordered suddenly, "look at the ground!"
Estelle glanced down. The next time the sun flashed into view she gasped.
The ground was white with snow!
"What has happened?" she demanded, terrified. "Oh, what has happened?"
Arthur fumbled at his chin awkwardly, watching the astonishing panorama outside. There was hardly any distinguishing between the times the sun was up and the times it was below now, as the darkness and light followed each other so swiftly the effect was the same as one of the old flickering motion-pictures.
As Arthur watched, this effect became more pronounced. The tall Fifth Avenue Building across the way began to disintegrate. In a moment, it seemed, there was only a skeleton there. Then that vanished, story by story. A great cavity in the earth appeared, and then another building became visible, a smaller, brown-stone, unimpressive structure.
With bulging eyes Arthur stared across the city. Except for the flickering, he could see almost clearly now.
He no longer saw the sun rise and set. There was merely a streak of unpleasantly brilliant light across the sky. Bit by bit, building by building, the city began to disintegrate and become replaced by smaller, dingier buildings. In a little while those began to disappear and leave gaps where they vanished.
Arthur strained his eyes and looked far down-town. He saw a forest of masts and spars along the waterfront for a moment and when he turned his eyes again to the scenery near him it was almost barren of houses, and what few showed were mean, small residences, apparently set in the midst of farms and plantations.
Estelle was sobbing.
"Oh, Mr. Chamberlain," she cried. "What is the matter? What has happened?"
Arthur had lost his fear of what their fate would be in his absorbing interest in what he saw. He was staring out of the window, wide-eyed, lost in the sight before him. At Estelle's cry, however, he reluctantly left the window and patted her shoulder awkwardly.
"I don't know how to explain it," he said uncomfortably, "but it's obvious that my first surmise was all wrong. The speed of the earth's rotation can't have been increased, because if it had to the extent we see, we'd have been thrown off into space long ago. But—have you read anything about the Fourth Dimension?"
Estelle shook her head hopelessly.
"Well, then, have you ever read anything by Wells? The 'Time Machine,' for instance?"
Again she shook her head.
"I don't know how I'm going to say it so you'll understand, but time is just as much a dimension as length and breadth. From what I can judge, I'd say there has been an earthquake, and the ground has settled a little with our building on it, only instead of settling down toward the center of the earth, or side-wise, it's settled in this fourth dimension."
"But what does that mean?" asked Estelle uncomprehendingly.
"If the earth had settled down, we'd have been lower. If it had settled to one side, we'd have been moved one way or another, but as it's settled back in the Fourth Dimension, we're going back in time."
"Then—"
"We're in a runaway skyscraper, bound for some time back before the discovery of America!"