men and of mammoths?

"For Nat-ul," murmured Nu, for Oo was about to spring.

As the mighty hurtling mass of bone and muscle, claws and fangs, shot through the air toward him the man swung his tiny stone hatchet with all the power behind his giant muscles, timing its release so nicely that it caught Oo in mid leap squarely between the eyes with the terrific force of a powder-sped projectile. Then Nu, cat-like as Oo himself, leaped agilely to one side as the huge bulk of the beast dashed, sprawling to the ground at the spot where the man had stood.

Scarce had the beast struck the earth than the cave man, knowing that his puny weapon could at best but momentarily stun the monster, drove his heavy spear deep into the glossy side just behind the giant shoulder.

Already Oo has regained his feet, roaring and screaming in pain and rage. The air vibrates and the earth trembles to his hideous shrieks. For miles around the savage denizens of the savage jungle bristle in terror, slinking further into the depths of their dank and gloomy haunts, casting the while affrighted glances rearward in the direction of that awesome sound.

With gaping jaws and wide spread talons the tiger lunges toward its rash tormentor who still stands gripping the haft of his primitive weapon. As the beast turns the spear turns also, and Nu is whipped about as a leaf at the extremity of a gale-tossed branch.

Striking and cavorting futilely the colossal feline leaps hither and thither in prodigious bounds as he strives to reach the taunting figure that remains ever just beyond the zone of those destroying talons. But presently Oo goes more slowly, and now he stops and crouches flat upon his belly. Slowly and cautiously he reaches outward and backward with one huge paw until the torturing spear is within his grasp.

Meanwhile the man screams taunts and insults into the face of his enemy, at the same time forcing the spear further and further into the vitals of the tiger, for he knows that once that paw encircles the spear's haft his chances for survival will be of the slenderest. He has seen that Oo is weakening from loss of blood, but there are many fighting minutes left in the big carcass unless a happy twist of the spear sends its point through the wall of the great heart.

But at length the beast succeeds. The paw closes upon the spear. The tough wood bends beneath the weight of those steel thews, then snaps short a foot from the tiger's body, and at 

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