Tharn, preceded and followed by guards, was led along the corridor to where it ended before a narrow door. In response to Wotar's knock it opened, disclosing a small chamber almost filled with a miscellany of weapons of every type known to prehistoric man. An attendant stood in the center of the room, awaiting instructions from the director.

"No weapons," Wotar said briefly. He turned to the cave-man. "You are to go directly to the arena's center and wait for whatever I send against you. Make a good fight of it and the crowd will be for you. That can mean much to you. If you manage to kill your opponent, return here at once. Do you understand?"

"Yes."

Wotar nodded to the attendant and the arena door was opened, flooding the room with sunshine. Tharn, blinking in the sudden light, stepped out on to the white sands of Sephar's Colosseum.

That which met his eyes was something Tharn was never to forget. The sandy floor was perhaps three hundred feet in length and half as many in width—a perfectly symmetrical ellipse surrounded by a sheer stone wall twelve feet in height. Beyond that wall the spectator stands began, tier upon tier of stone benches sloping up and back for fifty yards to the last row.

The thousands of seats were filled with a shifting mass of humans, most of whom had risen as Tharn came into sight.

Never before had the cave-man seen so many people at one time; and the noise and confusion affected him exactly as it would any jungle denizen. His first instinctive impulse was to retreat, not because of fright, for he knew no fear, but because it was strange and unpleasant and, worst of all, there was that infernal din which only man of all animals can long endure.

The cave lord halted and half turned as though to withdraw, but the crowd, believing him to be afraid, set up an ear-splitting clamor of catcalls, whistlings and raucous shouts that whirled the barbarian about in sudden anger.

For a long moment he glared at the multi-eyed beast above him; then a slight sound at his back aroused him to his immediate surroundings.

He wheeled just as a huge figure launched itself at his neck. Before Tharn could prevent it, strong fingers closed about his throat and the impact of a solid body sent him staggering, saved from falling only by superhuman effort.