hills and the vegetation swarming over it added to the illusion. But a closer look showed too much geometry for accidental weathering.

Gradually the outlines assumed form. City-size, it seemed to be the complex ramifications of a single building, terraced, overgrown with a thick matting of vines until the place resembled a hanging garden.

Kial Nasron suppressed a shiver, for there was an utterly alien quality about the megalithic structure that both depressed and frightened her. Over both city and hollow rose an aura of something dreadful and unholy, as if the ghosts of some ancient dwellers brooded in forgotten solitudes within.

As they descended the rough pathway and moved along the stone flagging toward the abandoned megalopolis, both man and girl were conscious of a quiver which ran through ground and air. Stopping, Alston knelt and placed a hand flat on the ground. Even through the thick moss, a vibration was perceptible, and something like a weak electric shock ran up his arm, numbing wrist, elbow and the shoulder joint. Now he was aware of a muted throbbing, like the beat of a heavy, steady pulse.

Nearer the city, ground tremors were stronger, and his ears caught a clearly audible echo from the vibrating air. Had he been wrong in believing the city was deserted? On the previous visit he had seen nothing nor felt any awareness of an alien presence.

Before them, the path shone in the rubrous light, and the city wall rose like a sheer cliff, casting a black shadow toward them like a reaching hand.

Now the ruin seemed more complete than before, and a vanguard of the forest reached out a dark arm, encircling the edifice.

"Looks as if the previous tenants had been careless with the fixtures," Kial Nasron said in mock bravado. "At least they did not forget the red carpet."

"Quiet neighborhood," Alston echoed her thought. Suddenly he knew what was different.

The silence. This time there was no hum of insect life, no rustling as the wind moved through the grass. No sense of movement as the wild things prowled at will within the dark labyrinths of the ancient city. There was silence, complete, profound, blanketing and smothering every sound save one, the muted throbbing.

Penetrating deeply into the shadow, they stood at last before a tall gateway. As they hesitated, a long 

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