was, indeed, she. Was he even now in possession of her?

Nu, too, wheeled to the west and raced rapidly along the well-marked trail. Since he had come upon the signs of Tur, Nu's speed had been infinitely greater than that of the Boat Builder. This his woodcraft told him, so he knew that he was constantly gaining upon the man who was still unconscious of the fact that he was being pursued.

Down the steep side of the ravine Tur must have slid and rolled in a most reckless fashion. At the bottom was a dense forest through which the trail led back toward the sea, after the man had made a series of frantic but futile attempts to scale the opposite heights.

What had he seen or heard or followed that had led him to make such desperate attempts to gain the opposite summit? Should Nu follow him down the ravine, or clamber to the vantage point the other had been unable to reach?

For an instant the troglodyte hesitated. Then he wheeled toward the cliff, and with the agility of long practice backed by ages of cliff dwelling forebears he clambered rapidly upward. At times he was forced to leap for a projecting rock above his head, dangling out over space as he drew himself, by mighty biceps and forearm, to the tiny foothold it afforded. Again, a gnarled root or a small crevice aided him in his ascent, until presently he crawled over the brow and stood erect once more on level ground.

Nu looked about, warily—there was no sign of the man or the woman. Then he examined the ground in ever enlarging circles, but no spoor such as he sought rewarded his eager eyes.

He had about decided to return to the bottom of the ravine and follow Tur's spoor when, clear and shrill from the west, there came to his ears the scream of a woman in distress.

And scarce had its first note risen upon the air than Nu, the son of Nu, was dashing madly in the direction of the sound.

VI

THE ANTHROPOID APES

As Nat-ul, surprised by Tur in her spying upon the village of the Boat Builders, fled north along the beach she had little hope of permanently distancing her pursuer. But she could do no less than flee, hoping against hope, that some chance accident might save her from capture.

It was in her mind to dodge into the jungle where it came down close to the water a 

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