hand toward the sleeping Terkoz, at the same time making a low, purring sound with his lips. The beast raised his head.

"Sh-h!" whispered Nu. Then he rose to a sitting posture, and very carefully put his feet to the floor. Stooping he lifted the heavy wolfhound in his arms. The only sign the animal made was to raise his muzzle to the man's face and lick his cheek. Nu smiled. He recalled Custer's words: "Terkoz will give the alarm even if he should be unable to stop you."

The troglodyte approached the cot on which Barney lay in peaceful slumber. He rested one hand upon the sill of the open window, leaning across the sleeper. Without a sound he vaulted over the cot, through the window and alighted noiselessly upon the veranda without. In the garden he deposited Terkoz, telling him to wait there, then he returned to the living room of the bungalow to fetch his spear, his hatchet and his knife. A moment later the figures of a naked man and a gaunt wolfhound swung away beneath the tropic moon across the rolling plain toward the mountains to the south.

X

ON THE TRAIL

It was daylight when Barney Custer awoke. His first thought was for his prisoner, and when his eyes fell upon the empty cot across the room the American came to the center of the floor with a single bound. Clad in his pajamas he ran out into the living room and gave the alarm. In another moment the search was on, but no sign of the caveman was to be found, nor of the guardian Terkoz.

"He must have killed the dog," insisted Greystoke; but they failed to find the beast's body, for the excellent reason that at that very moment Terkoz, bristling with anger, was nosing about the spot where, nearly a month before, he had been struck down by the Arab, as he had sought to protect the girl to whom he had attached himself.

As he searched the spot his equally savage companion hastened to the cave further up the mountainside, and with his knife unearthed the head of Oo which he had buried there in the soft earth of a crevice within the lair. The trophy was now in a rather sad state of putrefaction, and Nu felt that he must forego the pleasure of laying it intact at the feet of his future mate; but the great saber-teeth were there and the skull. He removed the former, fastening them to his gee-string and laid the balance of the head outside the cave where vultures might strip it clean of flesh against Nu's return, for he did not wish to be burdened with it during his search for Nat-ul.

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