the frail bridges were crowded with men. It was like peering into a gigantic glass hive, and it lay vertically below him with only a tough glass of unknown thickness to save him from a fall. The street showed warm and lit, and Graham was wet now to the skin with thawing snow, and his feet were numbed with cold. For a space he could not move.
"Come on!" cried his guide, with terror in his voice. "Come on!"
Graham reached the pitch of the roof by an effort.
Over the ridge, following his guide's example, he turned about and slid backward down the opposite slope very swiftly, amid a little avalanche of snow. While he was sliding he thought of what would happen if some broken gap should come in his way. At the edge he stumbled to his feet ankle deep in slush thanking heaven for an opaque footing again. His guide was already clambering up a metal screen to a level expanse.
Through the spare snowflakes above this loomed another line of vast windmills, and then suddenly the amorphous tumult of the rotating wheels was pierced with a deafening sound. It was a mechanical shrilling of extraordinary intensity that seemed to come simultaneously from every point of the compass.
"They have missed us already!" cried Graham's guide in an accent of terror, and suddenly, with a blinding flash, the night became day.
Above the driving snow, from the summits of the wind-wheels, appeared vast masts carrying globes of livid light. They receded in illimitable vistas in every direction. As far as his eye could penetrate the snowfall they glared.
"Get on this," cried Graham's conductor, and thrust him forward to a long grating of snowless metal that ran like a band between two slightly sloping expanses of snow. It felt warm to Graham's benumbed feet, and a faint eddy of steam rose from it.
"Come on!" shouted his guide ten yards off, and,
