Straight toward the boat ran Nu, and upon his heels raced the three warriors. One was coming toward him from the side. He was quite close, so close that he came upon Nu at the same instant that the latter reached the boat. The two fell upon one another with their great axes, but Nu, the son of Nu, was a mighty warrior. He dodged the blow of the other's ax, and before his adversary could recover himself to deliver a second Nu's weapon fell upon his skull, crushing it as if it had been an egg shell.

Now Nu seized the boat and dragged it toward the water as he had seen the strangers do. But he had taken but a half dozen steps when he was forced to turn and defend himself against the remaining warriors. With savage howls they were upon him, their women huddled upon the beach behind them shouting wild cries of encouragement to their men and defiance to the enemy. Nu abandoned the boat and rushed to meet his antagonists. His long spear, thrown with the power of the foremost Boat Builder, who was upon the point of hurling his stout harpoon at Nu. Down went the harpooner. Up rose a chorus of howls and lamentations from the women. Now the third warrior closed upon the troglodyte. It was too close for spear work, and so the fellow dropped his heavy weapon and leaped to close quarters with his knife. Down the two men went into the knee deep water, striking at one another with their knives as they sought death holds with their free hands. A great roller rumbled in upon them, turning them over and over as it carried them up the beach. Still they fought, sputtering and choking in the salty brine, but when the wave receded it left a corpse behind it upon the beach, stabbed through and through the great hairy chest by the long, keen knife of Nu, the son of Nu.

The cave man rose, dripping, to his feet and turned back toward the sea. The roller had carried the boat out with it. The women, furious now at the death of their three men, rushed forward to drag down the victor. Savage creatures they were, but little less sinister than their males. Their long hair streamed in the wind. Their faces were distorted by rage and hatred. They screamed aloud their taunts and insults and challenges; but Nu did not wait to battle with them. Instead he dove into the surf and struck out for the drifting boat. His spear was lost, but he clung to his ax. His knife he had returned to his gee-string.

They ran into the water to their waists, but Nu was beyond their reach. In a moment more he had come to the side of the boat. Tossing in his ax he clambered over the side, scarce escaping overturning the hollowed log. Once safely within he took up the paddle, an unaccustomed implement, and, fashioning his strokes after those of the men he had watched, he made headway from the shore.

The tide and the wind helped him, but he found, too, that he quickly mastered the art of paddling. First he discovered that when he paddled exclusively upon the side of his spear hand the boat turned in the opposite direction, and so he understood why the boatmen had paddled alternately upon one side and the other. When he did this the craft kept a straighter course in the direction he wished to go—the distant land of mystery.

Half way across the water that spread between the main land and the nearest island a monstrous shape loomed suddenly close to the boat's side. A long neck surmounted by a huge reptilian head shot above the surface, and wide gaping jaws opened to seize the paddler. Protruding eyes glared down upon him, and then the thing struck. Nu dodged to one side and struck back with his knife. With a hiss and scream the creature dove beneath the surface only to reappear a moment later upon the opposite side of the boat. Blood flowed from the knife wound in its neck. Again it snapped at the man, again the knife found its neck as Nu crouched to one side to elude the gaping jaws. Once more the thing dove, and almost simultaneously a mighty tail rose high out of the water above the man's head. Nu seized the paddle and drove the boat forward just as that terrific engine of destruction fell with a mighty whack upon the very spot the boat had quit. The blow, had it touched the craft, would have splintered it into firewood. For a few minutes the sea was churned to white, crimson stained by the creature's blood, as it thrashed about in impotent fury. Then, as Nu paddled away, the raging ceased and the great carcass floated upon its side.

On went Nu, paddling with redoubled energy toward the distant goal. What he expected to find at his journey's end he could not believe, yet what else was drawing him through countless dangers across the face of the terrible waters? The man, Tur, had come hither. He it was who had pursued Nat-ul. Was he still pursuing her? That he was following some woman Nu was positive from the fragments of conversation he had overhead, and yet though try as he would to believe it he could not make his judgment accept as a possibility the chance that it was really Nat-ul whom the man expected to find upon this distant land.

The wind had risen considerably since Nu set out upon his perilous journey. Already the waves were running high, tipped with white. That the island lay straight before the wind was all that saved the rude craft from instant annihilation. All about him the sea was alive with preying monsters. Titanic duels were in progress upon every hand, as the ferocious reptilia battled over their kills, or, turning from the chase, fell upon one another in frenzied joy of battle while their fortunate quarry swam rapidly away.

Through innumerable dangers swept the little tree-trunk skiff to be deposited at last upon the surf beaten beach of the nearest island. Scarce had Nu landed and dragged his boat above the rollers when he descried another boat a short distance from his own. That this belonged to the man, Tur, he had no doubt, and seizing his ax he hastened to it to pick up and follow the other's spoor wherever it might lead.

Clean cut and distinct in the sand Nu found the impress of Tur's sandals, nor did it require a second glance at them to convince the troglodyte that they had been made by the same feet that had pursued Nat-ul upon the mainland beach.