It was he that Nu selected for his prey.
      Stealthily the cave man crept through the tall grass, scarce a blade moving to the sinuous advance of his sleek body. Within fifty feet of the zebra Nu stopped, for the stallion was giving evidence of restlessness, as though sensing intuitively the near approach of a foe he could neither see, nor hear, nor smell.
      The man, still prone upon his belly, drew his spear into the throwing grasp. With utmost caution he wormed his legs beneath him, and then, like lightning and all with a single movement, he leaped to his feet and cast the stone-tipped weapon at his quarry.
      With a snort of terror the stallion reared to plunge away, but the spear had found the point behind his shoulder even as he saw the figure of the man arise from the tall grasses, and as the balance of the herd galloped madly off, their leader pitched headlong to the earth.
      Nu ran forward with ready knife, but the animal was dead before he reached its side -- the great spear had passed through its heart and was protruding upon the opposite side of the body. The man removed the weapon, and with his knife cut several long strips of meat from the plump haunches.
      Ever and anon he raised his head to scan the plain and jungle for evidences of danger, sniffing the breeze just as had the stallion he had killed. His work was but partially completed when he caught the scent of man yet a long way off. He knew that he could not be mistaken, yet never had he sensed so strange an odor. There were men coming, he knew, but of the other odors that accompanied them he could make nothing, for khaki and guns and sweaty saddle blankets and the stench of tanned leather were to Nu's nostrils as Greek would have been to his ears.
      It would be best thought Nu to retreat to the safety of the forest until he could ascertain the number and kind of beings that were approaching, and so, taking but careless advantage of the handier shelter, the cave man sauntered toward the forest, for now he was not stalking game, and never yet had he shown fear in the presence of an enemy. If their numbers were too great for him to cope with single handed he would not show himself; but none might ever say that he had seen Nu, the son of Nu, run away from danger.
      In his hand still swung the head of Oo, and as the man leaped to the low branches of a tree at the jungle's edge to spy upon the men he knew to be advancing from the far side of the plain, he fell to wondering how he was to find his way back to Nat-ul that he might place the trophy at her feet and claim her as his mate.
      Only the previous evening they had walked together hand in hand along the beach, and now he had not the remotest conception of where that beach lay. Straight across the plain should be the direction of it, for from that direction had he come to find the lair of Oo! But now all was changed. There was no single familiar landmark to guide him, not even the ape-people knew of any sea nearby, and he himself had no conception as to whether he was in the same world that he had traversed when last the sun shone upon him.
     

THE MYSTERIOUS HUNTER

     
      THE MORNING following the earthquake found Victoria Custer still confined to her bed. She told Lady Greystoke that she felt weak from the effects of the nervous shock; but the truth of the matter was that she dreaded to meet Curtiss and undergo the ordeal which she knew confronted her.
      How was she to explain to him the effect that the subterranean rumblings and the shaking of the outer crust had had upon her and her sentiments toward him? When her brother came in to see her she drew his head down upon the pillow beside hers and whispered something of the terrible hallucinations that had haunted her since the previous evening.
      "Oh, Barney," she cried, "what can it be? What can it be? The first deep grumblings that preceded the shock seemed to awake me as from a lethargy, and as plainly as I see you beside me now, I saw the half naked creature of my dreams, and when I saw him I knew that I could never wed Mr. Curtiss or any other -- it is awful to have to admit it even to you, Barney, but I -- I knew when I saw him that I loved him -- that I was his. Not his wife, Barney, but his woman -- his mate, and I had to fight with myself to keep from rushing out into the terrible blackness of the night to throw myself into his arms. It was then that I managed to control myself long enough to run to you, where I fainted. And last night, in my dreams, I saw him again, -- alone and lonely, searching through a strange and hostile world to find and claim me.
      "You cannot know, Barney, bow real he is to me. It is not as other dreams, but instead I really see him -- the satin texture of his smooth, bronzed skin; the lordly poise of his perfect head; the tousled shock of coal black hair that I have learned to love and through which I know I have run my fingers as he stooped to kiss me.
      "He carries a great spear, stone-tipped -- I should know it the moment that I saw it -- and a knife and hatchet of the same flinty material, and in his left hand he bears the severed head of a mighty beast.
      "He is a noble figure, but of another world or of another age; and somewhere he wanders so lonely and alone that my heart weeps at the thought of him. Oh, Barney, either he is true and I shall find him, or I am gone mad. Tell me Barney, for the love of heaven! you believe that I am sane."
      Barney Custer drew his sister's face close to his and kissed her tenderly.
      "Of course you're sane, Vic," he reassured her. "You've just allowed that old dream of yours to become a sort of obsession with you, and now it's gotten on your nerves until you are commencing to believe it even against your better judgment. Take a good grip on yourself, get up and join Curtiss in a long ride. Have it out with him. Tell him just what you have told me, and then tell him you'll marry him, and I'll warrant that you'll be dreaming about him instead of that young giant that you have stolen out of some fairy tale."
      "I'll get up and take a ride, Barney," replied the girl; "but as for marrying Mr. Curtiss -- well, I'll have to think it over."
      But after all she did not join the party that was riding toward the hills that morning, for the thought of seeing the torn and twisted strata of a bygone age that lifted its scarred head above the surface of the plain at the base of the mountains was more than she felt equal to. They did not urge her, and as she insisted that Mr. Curtiss accompany the other men she was left alone at the bungalow with Lady Greystoke, the baby and the servants.
      As the party trotted across the rolling land that stretched before them to the foothills they sighted a herd of zebras coming toward them in mad stampede.
      "Something is hunting ahead of us," remarked one of the men.
      "We may get a shot at a lion from the looks of it," replied another.
      A short distance further on they came upon the carcass of a zebra stallion. Barney and Butzow dismounted to examine it in an effort to determine the nature of the enemy that had dispatched it. At the first glance Barney called to one of the other members of the party, an experienced big game hunter.
      "What do you make of this, Brown?" he asked, pointing to the exposed haunch.
      "It is a man's kill," replied the other. "Look at that gaping hole over the heart, that would tell the story were it not for the evidence of the knife that cut away these strips from the rump. The carcass is still warm -- the kill must have been made within the past few minutes."
      "Then it wouldn't have been a man," spoke up another, or we should have heard the shot. Wait, here's Greystoke, let's see what he thinks of it."
      The ape man, who had been riding a couple hundred yards in rear of the others with one of the older men, now reined in close to the dead zebra.
      "What have we here?" he asked, swinging from his saddle.
      "Brown says this looks like the kill of a man," said Barney; "but none of us heard any shot."
      Tarzan grasped the zebra by a front and hind pastern and rolled him over upon his other side.
      "It went way through, whatever it was," said Butzow, as the hole behind this shoulder was exposed to view.