arrogant army of invaders? You who treated us with the patronizing kindness you reserve for amiable dogs?"

"We came in friendship—"

"—with armed space ships at your back—uninvited—unwelcome—smiling like the hypocrites you are!"

"Those entrusted with government on Terra would be happy to hear that you are willing to come forth and negotiate," Rex said.

Pandek arose from his throne, his brown face mottled with rage. "Negotiate for what is already ours? Put our stamp of approval on your conquest of our planet?"

Rex saw that further words were useless. He stood silent until the ruler's anger subsided. Then he asked, "What do you plan to do with us?"

"Kill you—as we will kill every Terran on our world."

He eyed Rex for signs of fear. When they did not appear he seemed mildly disappointed. When he spoke again it was in a quieter tone. "But first I would have you see a little of what Martian science is like. I would have you know how far ahead of the Terran bunglers our scientists were even a thousand years ago. I would have you know by what power Mars will again come into its own."

"I would like to see the work of your scientists." Conceit was obviously one of this ruler's weaknesses, Rex decided. He hoped others would reveal themselves.

"Very well, Terran. You shall see a part of the miracle concerning which you Terrans have wondered for years; the miracle by which your stolen lands below the polar circle have been watered and kept lush."

"The ice cliffs?"

"Yes. I cannot show you the process whereby the rains and the snows are created and drawn to the pole each season—how these great cliffs of ice are built over the winter months. But I can reveal to you the most spectacular part of the process—the melting of the ice cliffs."

In spite of their predicament, Rex was vitally interested. Jean, also. He glanced at her and saw the intent look on her face.

Pandek picked up a device at his elbow—obviously some sort of a telephone and spoke into it. His words were low and indistinguishable. But the results were almost instantaneous.

A far-away hum was heard, greatening in volume as from the release of 

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