"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