of foliage so dense that practically no light filtered down from the uneasy gray glare of the sky.

Colossal tree-ferns and gigantic mushrooms gave the place a goblin aspect, like the background of some sinister fairy-tale, and underfoot the ground moved queasily as if she trod upon the crust of quagmire. Coarse, thorny scrub and a moldering confusion of rotting tree trunks blocked the aisles, and higher up interwoven vines and trailing beards of moss knotted together the dense growth of trees in complex tapestries of shadow. Footing was treacherous, although a luminosity hovered above the sinks of decaying vegetation, and by this tricky light, they made frequent detours to avoid bogholes and the bubbling sinks of steaming-hot water. The air was thick, moist and nauseous with the foulness of gas rising from the layers of mold. Each step was an adventure.

After two hours of tramping and stumbling through choked aisles of sodden jungle, Kial Nasron was out on her feet.

Fortunately, they had reached higher ground. Outcroppings of lichen-crusted rock broke the morass of soft, unsteady ground, and she fell less often. Alston paid no heed to her or her difficulties. He marched steadily on, and, gasping and perspiration-soaked, she made shift to keep up. A terror of being abandoned in the awesome wilderness urged her faltering muscles.

They climbed a rise and came out on a flat, shelving rock at the top of a watershed. On the far side, the ledge overlooked a circular depression miles in extent. Here, Alston halted. The strength went out of Kial, and she collapsed weakly on the bare rock. Alston gave her food and water and seemed bitterly amused by her plight.

"We're almost there," he said. "Better get used to it. We're home."

On the near side, the hollow was rimmed by sheer cliffs, across its expanse, perhaps fifty miles away, was a chain of high, smoking volcanoes, their red glare reflected from the overcast, drenching the plain with hellish light. Hundreds of feet below was the pit floor, fairly level and carpeted with flowing grass or the ocherous moss.

Before them, sloping from a wedge-like salient of the precipice, a stone-flagged pathway lay straight across the plain toward the city!

At first, in the crimson splendor, it seemed less like a man-made fabric than some curious natural formation rising from the rust-tinted grasslands. In shape it was like a tangle of oddly regular 

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