As he forged on the scent of Ta became stronger, until at last the huge, ungainly beast loomed large before Nu's eyes. He was standing in a little clearing, in deep, rank jungle grasses, and had he not been head on toward Nu he would not have seen him, since even his acute hearing was far too dull to apprehend the noiseless tread of the cave man, moving lightly up wind.

As the tiny, blood-shot eyes of the primordial beast discovered the man the great head went down, and Ta, ill natured and bellicose progenitor of the equally ill natured and bellicose rhino of the twentieth century, charged the lithe giant who had disturbed his antediluvian meditation.

The creature's great bulk and awkward, uncouth lines belied his speed, for he tore down upon Nu with all the swiftness of a thoroughbred and had not the brain and muscle of the troglodyte been fitted by heritage and training to the successful meeting of such emergencies there would be no tale to tell today of Nu of the Niocene.

But the young man was prepared, and turning he ran with the swiftness of a hare toward the nearest tree, a huge, arboraceous fern towering upon the verge of the little clearing. Like a cat the man ran up the perpendicular bole, his hands and feet seeming barely to touch the projecting knobs marking the remains of former fronds which converted the towering stem into an easy stairway for such as he.

About Nu's neck his stone-tipped spear hung by its rawhide thong down his back, while stone hatchet and stone knife dangled from his gee-string, giving him free use of his hands for climbing. You or I, having once gained the seeming safety of the lowest fronds of the great tree, fifty feet above the ground, might have heaved a great sigh of relief that we had thus easily escaped the hideous monster beneath; but not so Nu, who was wise to the ways of the creatures of his remote age.

Not one whit did he abate his speed as he neared the lowest branch, nor did he even waste a precious second in a downward glance at his enemy. What need, indeed? Did he not know precisely what Ta would do? Instead he swung, monkey-like, to the broad leaf, and though the chances he took would have paled the face of a brave man today they did not cause Nu even to hesitate, as he ran lightly and swiftly along the bending, swaying frond, leaping just at the right instant toward the bole of a nearby jungle giant.

Nor was he an instant too soon. The frond from which he had sprung had scarce whipped up from beneath his weight when Ta, with all the force and momentum of a runaway locomotive, struck the base of the tree head on. The jar of that terrific collision shook the earth, there was the sound of the splintering of wood, and the mighty tree toppled to the ground with a deafening crash.

Nu, from an adjoining tree, looked down and grinned. He was not hunting Ta that day, and so he sprang from tree to tree until he had passed around the clearing, and then, coming to the surface once more, continued his way toward the distant lava cliffs where Oo, the man hunter, made his grim lair.

From among the tangled creepers through which the man wormed his sinuous way ugly little eyes peered down upon him from beneath shaggy, beetling brows, and great fighting tusks were bared, as the hairy ones growled and threatened from above; but Nu paid not the slightest attention to the huge, ferocious creatures that menaced him upon every hand. From earliest childhood he had been accustomed to the jabberings and scoldings of the ape-people, and so he knew that if he went his way in peace, harming them not, they would offer him no harm. One of lesser experience might have attempted to drive them away with menacing spear, or well-aimed hatchet, and thus have drawn down upon him a half dozen or more ferocious bulls against which no single warrior, however doughty, might have lived long enough to count his antagonists.

Threatening and unfriendly as the apes seemed the cave man really looked upon them as friends and allies, since between them and his own people there existed a species of friendly alliance, due no doubt to the similarity of their form and structure. In that long gone age when the world was young and its broad bosom teemed with countless thousands of carnivorous beasts and reptiles, and other myriads blackened the bosoms of its inland seas, and filled its warm, moist air with the flutter of their mighty, bat-like wings, man's battle for survival stretched from sun to sun—there was no respite. His semiarboreal habits took him often into the domains of the great and lesser apes, and from this contact had arisen what might best be termed an armed truce, for they alone of all the other inhabitants of the earth had spoken languages, both meager it is true, yet sufficient to their primitive wants, and as both languages had been born of the same needs to deal with identical conditions there were many words and phrases identical to both. Thus the troglodyte and the primordial ape could converse when necessity demanded, and as Nu traversed their country he understood their grumbling and chattering merely as warnings to him against the performance of any overt act. Had danger lurked in his path the hairy ones would have warned him of that too, for of such was their service to man who in return often hunted the more remorseless of their enemies, driving them from the land of the anthropoids.