The tumult seemed to have extended to the very limits of the city, and was constantly increasing. The smashing of timber and the falling of heavy stones were heard near by.

Tradmos leaned far over the parapet. “They are coming toward us!” he said; “they intend to destroy the palace; we must try to get down, but we shall meet danger even there.”

[ [!-- H2 anchor --] ]

Chapter XIII.

Johnston and Branasko looked down at the great ball of light below them in silent wonder. Johnston was the first to speak. He pointed to the four massive cables which supported the sun at each corner of the platform and extended upward till they were enveloped in the darkness.

“They hold us up,” he said, “where do they go to?”

“To the big trucks which run on the tracks near the roof of the cavern; the endless cables are up there, too, but we can not see them with this glare about us.”

“We can see nothing of Alpha from here,” remarked Johnston disappointedly, “we can see nothing beyond our circle of light.”

“I should like to look down from this height at night,” said the Alphian. “It would be a great view.”

“What is this?” Johnston went to one side of the platform and laid his hand on the spokes of a polished metal wheel shaped like the pilot-wheel of a steamboat. Branasko hastened to him.