he said, "until the next light. The tribe will travel north beside the Restless Sea beyond the Barren Cliffs. Because of the old and the babes we shall move slowly. It will be easy for you to overtake us. If you do not come we shall know that Oo was mightier than the son of Nu."

Without other words the two older men turned and retraced their steps toward the village, while Nu, the son of Nu, climbed again to his perch within the tree.

All day he watched for the return of Oo. The great apes and the lesser apes passed below and above and around him. Sometimes they threw him a word in passing. Below, the woolly rhinoceros browsed and lay down to sleep. A pack of hyenas slunk down from the plateau above the cliffs. They circled the sleeping perissodactyl. The great beast opened its little eyes. Lumberingly it came to its feet, wheeling about until it faced up wind, then, like a mountain run amuck, it charged straight for the line of now growling hyenas. The cowardly brutes leaped aside, and the whole pack closed upon the rear of the rhinoceros. The big beast turned, quick as a cat. Down went his armed snout and one of his tormentors was hurled far aloft, torn by the mighty horn that had pierced him through. Again the rhinoceros wheeled and ran, and again the pack closed in upon him. The jungle swallowed them, but for a long time Nu could hear the savage growls of the pursuing beasts, and the yells of pain as from time to time the rhinoceros turned upon his tormentors.

Then came a cave-bear, lumbering down the face of the cliff. At the mouth of the cave of Oo he halted sniffing about warily, and uttering deep throated growls of rage and hate. Nu listened for the answering challenge of the ancient enemy of Ur, but no sound came. Nu shrugged his shoulders. It was evident that Oo was far away, otherwise he would never have let Ur's challenge go unanswered.

Now the bear had continued his way to the foot of the cliff. He was advancing toward the tree in which Nu sat. At the edge of the jungle the beast halted and commenced to nose in the soft earth for roots. Nu watched him. If not the head of Oo, why not the head of Ur? Oo would not return that day, of that Nu was positive, for it was already late in the afternoon and if the great tiger had been near he would have heard and answered the challenge of the cave-bear.

Nu dropped lightly to the ground upon the opposite side of the tree from Ur. In his right hand he grasped his long, heavy spear. In his left was his stone ax. He approached the huge beast from the rear, coming 

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