recently, crude metals. None of which worked. In ten thousand more life times perhaps we'll have made a metal in which will flow cool water to protect us on the march to the ship. But we work so slowly, so blindly. This morning, mature, I took up my instruments. Tomorrow, dying, I lay them down. What can one man do in one day? If we had ten thousand men, the problem would be solved...."

"I will go to the ship," said Sim.

"Then you will die," said the old man. A silence had fallen on the room at Sim's words. Then the men stared at Sim. "You are a very selfish boy."

"Selfish!" cried Sim, resentfully.

The old man patted the air. "Selfish in a way I like. You want to live longer, you'll do anything for that. You will try for the ship. But I tell you it is useless. Yet, if you want to, I cannot stop you. At least you will not be like those among us who go to war for an extra few days of life."

"War?" asked Sim. "How can there be war here?"

And a shudder ran through him. He did not understand.

"Tomorrow will be time enough for that," said Dienc. "Listen to me, now."

The night passed.

VII

It was morning. Lyte came shouting and sobbing down a corridor, and ran full into his arms. She had changed again. She was older, again, more beautiful. She was shaking and she held to him. "Sim, they're coming after you!"

Bare feet marched down the corridor, surged inward at the opening. Chion stood grinning there, taller, too, a sharp rock in either of his hands. "Oh, there you are, Sim!"

"Go away!" cried Lyte savagely whirling on him.

"Not until we take Sim with us," Chion assured her. Then, smiling at Sim. "If that is, he is with us in the fight."

Dienc shuffled forward, his eye weakly fluttering, his bird-like hands fumbling in the air. "Leave!" he shrilled angrily. "This boy is a Scientist now. He works with us."

Chion ceased smiling. "There is better work to be done. We go now to fight the people in the farthest cliffs." His eyes glittered anxiously. "Of course, you will come with us, Sim?"

"No, no!" Lyte clutched at his arm.

Sim 

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