"There is no escape from Thag. Thag is the center of creation. All things are Thag's. When he calls, you must answer. When he hungers, he will have you. Beware of Thag!"

Smith considered that for a moment in silence. In the main he felt confident that he had understood their warning correctly, and he had little reason to doubt that they knew whereof they spoke. Thag might not be the center of the universe, but if they said he could call a victim from anywhere in the land, Smith was not disposed to doubt it. The priestess' willingness to let him leave her unhindered, yes, even her scornful laughter as he looked back, told the same story. Whatever Thag might be, his power in this land could not be doubted. He made up his mind suddenly what he must do, and turned to the breathlessly waiting little folk.

"Which way--lies Thag?" he asked.

A score of dark, thin arms pointed. Smith turned his head speculatively toward the spot they indicated. In this changeless twilight all sense of direction had long since left him, but he marked the line as well as he could by the formation of the trees, then turned to the little people with a ceremonious farewell rising to his lips.

"My thanks for----" he began, to be interrupted by a chorus of whispering cries of protest. They seemed to sense his intention, and their pleadings were frantic. A panic anxiety for him glowed upon every little terrified face turned up to his, and their eyes were wide with protest and terror. Helplessly he looked down.

"I--I must go," he tried stumblingly to say. "My only chance is to take Thag unawares, before he sends for me."

He could not know if they understood. Their chattering went on undiminished, and they even went so far as to lay tiny hands on him, as if they would prevent him by force from seeking out the terror of their lives.

"No, no, no!" they wailed murmurously. "You do not know what it is you seek! You do not know Thag! Stay here! Beware of Thag!"

A little p.r.i.c.kling of unease went down Smith's back as he listened. Thag must be very terrible indeed if even half this alarm had foundation. And to be quite frank with himself, he would greatly have preferred to remain here in the hidden quiet of the hollow, with its illusion of shelter, for as long as he was allowed to stay. But he was not of the stuff that yields very easily to its own terrors, and hope burned strongly in him still. So he squared his broad shoulders and turned resolutely in the direction the tree-folk had indicated.

When they saw that he meant to go, their protests sank to a wail of bitter grieving. With that sound moaning behind him he went up out of the hollow, like a man setting forth to the music of his own dirge. A few of the bravest went with him a little way, flitting through the underbrush and darting from tree to tree in a timidity so deeply ingrained that even when no immediate peril threatened they dared not go openly through the twilight.

Their presence was comforting to Smith as he went on. A futile desire to help the little terror-ridden tribe was rising in him, a useless grat.i.tude for their warning and their friendliness, their genuine grieving at his departure and their odd, paradoxical bravery even in the midst of hereditary terror. But he knew that he could do nothing for them, when he was not at all sure he could even save himself. Something of their panic had communicated itself to him, and he advanced with a sinking at the pit of his stomach. Fear of the unknown is so poignant a thing, feeding on its own terror, that he found his hands beginning to shake a little and his throat going dry as he went on.

The rustling and whispering among the bushes dwindled as his followers one by one dropped away, the bravest staying the longest, but even they failing in courage as Smith advanced steadily in that direction from which all their lives they had been taught to turn their faces.

Presently he realized that he was alone once more. He went on more quickly, anxious to come face to face with this horror of the twilight and dispel at least the fearfulness of its mystery.

The silence was like death. Not a breeze stirred the leaves, and the only sound was his own breathing, the heavy thud of his own heart.

Somehow he felt sure that he was coming nearer to his goal. The hush seemed to confirm it. He loosened the force-gun at his thigh.

In that changeless twilight the ground was sloping down once more into a broader hollow. He descended slowly, every sense alert for danger, not knowing if Thag was beast or human or elemental, visible or invisible.

The trees were beginning to thin. He knew that he had almost reached his goal.

He paused at the edge of the last line of trees. A clearing spread out before him at the bottom of the hollow, quiet in the dim, translucent air. He could focus directly upon no outlines anywhere, for the tapestried blurring of the place. But when he saw what stood in the very center of the clearing he stopped dead-still, like one turned to stone, and a shock of utter cold went chilling through him. Yet he could not have said why.

For in the clearing's center stood the Tree of Life. He had met the symbol too often in patterns and designs not to recognize it, but here that fabulous thing was living, growing, actually springing up from a rooted firmness in the spangled gra.s.s as any tree might spring. Yet it could not be real. Its thin brown trunk, of no recognizable substance, smooth and gleaming, mounted in the traditional spiral; its twelve fantastically curving branches arched delicately outward from the central stem. It was bare of leaves. No foliage masked the serpentine brown spiral of the trunk. But at the tip of each symbolic branch flowered a blossom of b.l.o.o.d.y rose so vivid he could scarcely focus his dazzled eyes upon them.

This tree alone of all objects in the dim land was sharply distinct to the eye--terribly distinct, remorselessly clear. No words can describe the amazing menace that dwelt among its branches. Smith's flesh crept as he stared, yet he could not for all his staring make out why peril was so eloquent there. To all appearances here stood only a fabulous symbol miraculously come to life; yet danger breathed out from it so strongly that Smith felt the hair lifting on his neck as he stared.

It was no ordinary danger. A nameless, choking, paralyzed panic was swelling in his throat as he gazed upon the perilous beauty of the Tree.

Somehow the arches and curves of its branches seemed to limn a pattern so dreadful that his heart beat faster as he gazed upon it. But he could not guess why, though somehow the answer was hovering just out of reach of his conscious mind. From that first glimpse of it his instincts shuddered like a shying stallion, yet reason still looked in vain for an answer.

Nor was the Tree merely a vegetable growth. It was alive, terribly, ominously alive. He could not have said how he knew that, for it stood motionless in its empty clearing, not a branch trembling, yet in its immobility more awfully vital than any animate thing. The very sight of it woke in Smith an insane urging to flight, to put worlds between himself and this inexplicably dreadful thing.

Crazy impulses stirred in his brain, coming to insane birth at the calling of the Tree's peril--the desperate need to shut out the sight of that thing that was blasphemy, to put out his own sight rather than gaze longer upon the perilous grace of its branches, to slit his own throat that he might not need to dwell in the same world which housed so frightful a sight as the Tree.

All this was a mad battering in his brain. The strength of him was enough to isolate it in a far corner of his consciousness, where it seethed and shrieked half heeded while he turned the cool control which the s.p.a.ceways life had taught him to the solution of this urgent question. But even so his hand was moist and shaking on his gun-b.u.t.t, and the breath rasped in his dry throat.

Why--he asked himself in a determined groping after steadiness--should the mere sight of a tree, even so fabulous a one as this, rouse that insane panic in the gazer? What peril could dwell invisibly in a tree so frightful that the living horror of it could drive a man mad with the very fact of its unseen presence? He clenched his teeth hard and stared resolutely at that terrible beauty in the clearing, fighting down the sick panic that rose in his throat as his eyes forced themselves to dwell upon the Tree.

Gradually the revulsion subsided. After a nightmare of striving he mustered the strength to force it down far enough to allow reason's entry once more. Sternly holding down that frantic terror under the surface of consciousness, he stared resolutely at the Tree. And he knew that this was Thag.

It could be nothing else, for surely two such dreadful things could not dwell in one land. It must be Thag, and he could understand now the immemorial terror in which the tree-folk held it, but he did not yet grasp in what way it threatened them physically. The inexplicable dreadfulness of it was a menace to the mind's very existence, but surely a rooted tree, however terrible to look at, could wield little actual danger.

As he reasoned, his eyes were seeking restlessly among the branches, searching for the answer to their dreadfulness. After all, this thing wore the aspect of an old pattern, and in that pattern there was nothing dreadful. The tree of life had made up the design upon that well-top in Illar through whose shadow he had entered here, and nothing in that bronze grille-work had roused terror. Then why----? What living menace dwelt invisibly among these branches to twist them into curves of horror?

A fragment of old verse drifted through his mind as he stared in perplexity:

What immortal hand or eye Could frame thy fearful symmetry?

And for the first time the true significance of a "fearful symmetry"

broke upon him. Truly a more than human agency must have arched these subtle curves so delicately into dreadfulness, into such an awful beauty that the very sight of it made those atavistic terrors he was so sternly holding down leap in a gibbering terror.

A tremor rippled over the Tree. Smith froze rigid, staring with startled eyes. No breath of wind had stirred through the clearing, but the Tree was moving with a slow, serpentine grace, writhing its branches leisurely in a horrible travesty of voluptuous enjoyment. And upon their tips the blood-red flowers were spreading like cobra's hoods, swelling and stretching their petals out and glowing with a hue so eye-piercingly vivid that it transcended the bounds of color and blazed forth like pure light.

But it was not toward Smith that they stirred. They were arching out from the central trunk toward the far side of the clearing. After a moment Smith tore his eyes away from the indescribably dreadful flexibility of those branches and looked to see the cause of their writhing.

A blaze of luminous white had appeared among the trees across the clearing. The priestess had returned. He watched her pacing slowly toward the Tree, walking with a precise and delicate grace as liquidly lovely as the motion of the Tree. Her fabulous hair swung down about her in a swaying robe that rippled at every step away from the moon-white beauty of her body. Straight toward the Tree she paced, and all the blossoms glowed more vividly at her nearness, the branches stretching toward her, rippling with eagerness.

Priestess though she was, he could not believe that she was going to come within touch of that Tree the very sight of which roused such a panic instinct of revulsion in every fiber of him. But she did not swerve or slow in her advance. Walking delicately over the flowery gra.s.s, arrogantly luminous in the twilight, so that her body was the center and focus of any landscape she walked in, she neared her horribly eager G.o.d.

Now she was under the Tree, and its trunk had writhed down over her and she was lifting her arms like a girl to her lover. With a gliding slowness the flame-tipped branches slid round her. In that incredible embrace she stood immobile for a long moment, the Tree arching down with all its curling limbs, the girl straining upward, her head thrown back and the mantle of her hair swinging free of her body as she lifted her face to the quivering blossoms. The branches gathered her closer in their embrace. Now the blossoms arched near, curving down all about her, touching her very gently, twisting their blazing faces toward the focus of her moon-white body. One poised directly above her face, trembled, brushed her mouth lightly. And the Tree's tremor ran unbroken through the body of the girl it clasped.

The incredible dreadfulness of that embrace was suddenly more than Smith could bear. All his terrors, crushed down with so stern a self-control, without warning burst all bounds and rushed over him in a flood of blind revulsion. A whimper choked up in his throat and quite involuntarily he swung round and plunged into the shielding trees, hands to his eyes in a futile effort to blot out the sight of lovely horror behind him whose vividness was burnt upon his very brain.

Heedlessly he blundered through the trees, no thought in his terror-blank mind save the necessity to run, run, run until he could run no more. He had given up all attempt at reason and rationality; he no longer cared why the beauty of the Tree was so dreadful. He only knew that until all s.p.a.ce lay between him and its symmetry he must run and run and run.

What brought that frenzied madness to an end he never knew. When sanity returned to him he was lying face down on the flower-spangled sward in a silence so deep that his ears ached with its heaviness. The gra.s.s was cool against his cheek. For a moment he fought the back-flow of knowledge into his emptied mind. When it came, the memory of that horror he had fled from, he started up with a wild thing's swiftness and glared around pale-eyed into the unchanging dusk. He was alone. Not even a rustle in the leaves spoke of the tree-folk's presence.

For a moment he stood there alert, wondering what had roused him, wondering what would come next. He was not left long in doubt. The answer was shrilling very, very faintly through that aching quiet, an infinitesimally tiny, unthinkably far-away murmur which yet pierced his ear-drums with the sharpness of tiny needles. Breathless, he strained in listening. Swiftly the sound grew louder. It deepened upon the silence, sharpened and shrilled until the thin blade of it was vibrating in the center of his innermost brain.

And still it grew, swelling louder and louder through the twilight world in cadences that were rounding into a queer sort of music and taking on such an unbearable sweetness that Smith pressed his hands over his ears in a futile attempt to shut the sound away. He could not. It rang in steadily deepening intensities through every fiber of his being, piercing him with thousands of tiny music-blades that quivered in his very soul with intolerable beauty. And he thought he sensed in the piercing strength of it a vibration of queer, unnamable power far mightier than anything ever generated by man, the dim echo of some cosmic dynamo's hum.

The sound grew sweeter as it strengthened, with a queer, inexplicable sweetness unlike any music he had ever heard before, rounder and fuller and more complete than any melody made up of separate notes. Stronger and stronger he felt the certainty that it was the song of some mighty power, humming and throbbing and deepening through the twilight until the whole dim land was one trembling reservoir of sound that filled his entire consciousness with its throbbing, driving out all other thoughts and realizations, until he was no more than a sh.e.l.l that vibrated in answer to the calling.