was going to force the soapy liquid into the hollow pile by steam.

At a signal steam began to hiss in the boiler. Live steam from
the fire-room forced the soapy sirup out of the boiler, through
the small iron pipe, into the hollow that led to the geyser far
underground. Six thousand gallons in all were forced into the
opening in a space of three minutes.

Arthur's grimy gang began to work with desperate haste. Quickly
they withdrew the iron pipe and inserted a long steel plug,
painfully beaten from a bar of solid metal. Then, girding the
colossal concrete pile, ring after ring of metal was slipped on,
to hold the plug in place.

The last of the safeguards was hardly fastened firmly when Estelle
listened intently.

"I hear a rumbling!" she said quietly.

Arthur reached forward and put his hand on the mass of concrete.

"It is quivering!" he reported as quietly. "I think we'll be on
our way in a very little while."

The group broke for the stairs, to watch the panorama as the runaway
sky-scraper made its way back through the thousands of years to
the times that had built it for a monument to modern commerce.

Arthur and Estelle went high up in the tower. From the window of
Arthur's office they looked eagerly, and felt the slight quiver as