love, their brief youth, give up one interval of sunset or sunrise!"

Sim leaned against the table, earnestly. "I understand."

"You do?" The old man stared at him blindly. He sighed and slapped the child's thigh, gently. "Yes, of course, you do. It's too much to expect anyone to understand, any more. You're rare."

The others moved in around Sim and the old man.

"I am Dienc. Tomorrow night Cort here will be in my place. I'll be dead by then. And the night after that someone else will be in Cort's place, and then you, if you work and believe—but first, I give you a chance. Return to your playmates if you want. There is someone you love? Return to her. Life is short. Why should you care for the unborn to come? You have a right to youth. Go now, if you want. Because if you stay you'll have no time for anything but working and growing old and dying at your work. But it is good work. Well?"

Sim looked at the tunnel. From a distance the wind roared and blew, the smells of cooking and the patter of naked feet sounded, and the laughter of lovers was an increasingly good thing to hear. He shook his head, impatiently, and his eyes were wet.

"I will stay," he said.

VI

The third night and third day passed. It was the fourth night. Sim was drawn into their living. He learned about that metal seed upon the top of the far mountain. He heard of the original seeds—things called "ships" that crashed and how the survivors hid and dug in the cliffs, grew old swiftly and in their scrabbling to barely survive, forgot all science. Knowledge of mechanical things had no chance of survival in such a volcanic civilization. There was only NOW for each human.

Yesterday didn't matter, tomorrow stared them vividly in their very faces. But somehow the radiations that had forced their aging had also induced a kind of telepathic communication whereby philosophies and impressions were absorbed by the new born. Racial memory, growing instinctively, preserved memories of another time.

"Why don't we go to that ship on the mountain?" asked Sim.

"It is too far. We would need protection from the sun," explained Dienc.

"Have you tried to make protection?"

"Salves and ointments, suits of stone and bird-wing and, 

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