Grôm looked at the girl with piercing anxiety such as he had never known before.

“Can you run, very fast?” he demanded.

The girl laughed, her terror almost forgotten in her pride at having once more saved him.

“I ran from the wolves,” she reminded him.

“Then we must run, perhaps very far,” answered Grôm, reassured, “till we find some place of steep rocks where we can fight with some hope. For these beasts are obstinate, and will never give up from pursuing us. And, unlike the red cave-bears they seem to know how to climb trees.”

When both bears were high in the two trees, Grôm and the girl slipped down by the bending tips of the branches, almost as swiftly as falling. They snatched up Grôm’s two spears and A-ya’s broken one, and ran, down along the brook toward the line of the smoking hills. The bears, descending more slowly, came after them at a terrific, ponderous gallop.

The girl ran, as she had said, well––so well that Grôm who was famous in the tribe for his running, did not have greatly to slacken his pace in her favor. Finding that, at first, they gained slightly on their pursuers, Grôm bade her slow down a little till they did no more than hold their own. Fearing lest she should exhaust herself, he ran always a pace behind her, admonishing her how to save her strength and her breath, and ever warily casting his eyes about for a 63 possible refuge. Warily, too, he chose the smoothest ways, sparing her feet. For he knew that if she gave out and fell he would stop and fight his last fight over her body.

For an hour or more the girl ran easily. Then she began to show signs of distress. Her face grew ashen, the breath came harshly from her open lips, and once or twice she stumbled. With the first pang of fear at his heart, Grôm closed up beside her, made her lean heavily on his rigid forearm, and cheered her with words of praise. He pointed to a spur of broken mountains now close ahead, with a narrow valley cleaving them midway.

“There will be ledges,” he said, “where we can defend ourselves, and where you can rest.”

Skirting a bit of jungle, so dense with massive cane and thorned creepers that nothing could penetrate it, they came suddenly upon a space of barren gray plain, and saw, straight ahead, the opening of the valley. It was not more than a couple of furlongs distant. And its walls, partly clothed with shrubbery, partly naked, were so seamed and cleft and creviced that they appeared to promise many convenient retreats. But across the mouth of the valley extended an appalling barrier. From an irregular fissure in the parched earth, running on a slant from one wall to the other, came tongues of red flame, waving upwards to a height of several feet, sinking back, rising again, and bowing as if in some enchanted dance.