home. At mid-afternoon she passed them scarce half a mile away, for they had taken the way that led upon the far side of the jungle that they might meet the returning mammoth hunters, and so Nat-ul came to the deserted caves of her tribe at nightfall only to find that her people had departed.

Supperless, she crawled into one of the smaller and higher caves, for it would be futile to attempt to discover the trail of the departed tribe while night with its darkness and its innumerable horrors enveloped the earth. She had dozed once when she was awakened by the sound of movement upon the face of the cliff. Scarce breathing, she lay listening. Was it man or beast that roamed through the deserted haunts of her tribe? Higher and higher up the face of the cliff came the sound of the midnight prowler. That the creature, whatever it was, was making a systematic search of the caves seemed all too apparent. It would be but a question of minutes before it would reach her hiding place.

Nat-ul grasped her knife more firmly. The sounds ceased upon the ledge directly beneath her. Then, after a few moments they were resumed, but to the girl's relief they now retreated down the steep bluff. Presently they ceased entirely, and though it was hours before she could quiet her fears she at last fell into a deep slumber.

At dawn Nu, the son of Nu, awoke. He rose and stretched himself, standing in the glare of the new sun upon the ledge before his cave. Fifty feet above him slept the girl he loved. Nu gathered up his weapons and his bear skin, and moved silently down to the spring where he quenched his thirst. Then he passed through the jungle to the sea. Here he removed his loincloth and the skin that covered his shoulders and waded into the surf. In his right hand he held his knife, for great reptiles inhabited the Restless Sea. Carefully he bathed, keeping a wary watch for enemies in the water or upon the land behind. In him was no fear, for he knew no other existence than that which might present at any moment the necessity of battling for his life with some slimy creature of the deep, or equally ferocious denizen of the jungle or the hills. To Nu it was but a part of the day's work. You or I might survive a single day were we suddenly cast back into the primeval savagery of Nu's long dead age, and Nu, if as suddenly transplanted to the corner of Fifth Avenue and Twenty-third Street might escape destruction for a few hours, but sooner or later a trolley car or a taxi would pounce upon him.

His ablutions completed, the troglodyte replaced his loin cloth and his shaggy fur, took up his 

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