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