through the opening. For minutes the frightful din endured, and with it the sickening tossing of the earth; but, at last, the rumblings ceased, the world sank back to rest, exhausted.

And Nu lay unconscious where he had fallen.

II

BACK TO THE STONE AGE

It was morning when Nat-ul awoke. The sun was streaming in across a wide sea to illumine the interior of the cave where she lay huddled in a great pile of soft, furry pelts. Near her lay a woman, older than herself, but still beautiful. In front of them, nearer the mouth of the cave, two men slept. One was Tha, her father, and the other her brother, Aht. The woman was Nat-ul's mother, Lu-tan. Now she, too, opened her eyes. She stretched, raising her bare, brown arms above her head, and half turning on her side toward Nat-ul—it was the luxurious movement of the she-tiger—the embodiment of perfect health and grace. Lu-tan smiled at her daughter, exposing a row of strong, white, even teeth. Nat-ul returned the smile.

"I am glad that it is light again," said the girl. "The shaking of the ground, yesterday, frightened me, so that I had the most terrible dreams all during the darkness—ugh!" and Nat-ul shuddered.

Tha opened his eyes and looked at the two women.

"I, too, dreamed," he said. "I dreamed that the earth shook again; the cliffs sank; and the Restless Sea rolled in upon them, drowning us all. This is no longer a good place to live. After we have eaten I shall go speak to Nu, telling him that we should seek other caves in a new country."

Nat-ul rose and stepping between the two men came to the ledge before the entrance to the cave. Before her stretched a scene that was perfectly familiar and yet strangely new. Below her was an open patch at the foot of the cliff, all barren and boulder strewn except for a rude rectangle that had been cleared of rock and debris. Beyond lay a narrow strip of tangled tropical jungle. Enormous fern-like trees lifted their huge fronds a hundred feet into the air. The sun was topping the horizon, coming out of a great sea that lay just beyond the jungle. And such a sun! It was dull red and swollen to an enormous size. The atmosphere was thick and hot—almost sticky. And the life! Such countless myriads of creatures teeming through the jungle, winging their way through the air, and blackening the surface of the sea!

Nat-ul knit her brows. She was trying 

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