Alan was still screaming futilely.

Babs huddled with white horrified face, staring. Then I went out after Polter. My disappearing legs were great dark blurs in the sky. Alan saw the valley now contracted to a thousand feet of width, with its cliffs equally as high. Then everything was smaller.... The sky overhead went dark again from cliff to cliff as a segment of rolling bodies momentarily spanned the opening.

Presently Alan realized that the valley had narrowed to a pit. He stood up. "Hurry! Now we can go after them. Up there!"

The opening above was empty. Polter and I were fighting some distance away....

Dr. Kent was soon large enough to scramble out of the pit. Alan handed the little Babs up to him and followed. Alan saw that they were now in a long gully, blind at one end with a five hundred foot perpendicular cliff. Against the wall, the t.i.tanic form of Polter stood at bay. And I was confronting him. The summit of the cliff was lower than our waists.

Triumph swept Alan; he saw that I was the larger! As Polter bored into me my backward step crossed the full width of the gully. Alan shouted:

"Down! Babs--Father!"

They had barely time to flatten themselves in a narrow crevice between upstanding rocks before my foot crashed down. For an instant the sole of my foot formed a flat black ceiling as it spanned the rocks. Then it lifted and was gone with a blurred swoop. They saw the white blur of my hand come down and s.n.a.t.c.h a tremendous boulder, raising it with a great sweep of movement into the sky. They saw me crash it against Polter; but it only struck his shoulder. He roared with anger. The whole sky was roaring and rumbling with our shouts and our panting breathing, and the ground was clattering, pounding with our giant tread. Huge loose boulders were tumbled in an avalanche everywhere.

Again it seemed to Alan that our lurching, heedlessly surging bodies must be crushed within these contracting walls. Only our locked, intertwined legs were visible; our bodies were lost in the sky. Then it seemed to Alan that I had heaved Polter upward. And followed him. We disappeared. There was a distant overhead rumble, and the murky sky, with vague patches of far-distant illumination in it, became empty of movement....

The walls presently were again closing upon Alan and his companions.

They ran out of the open end of the shrinking little gully and came to a new upward vista....

I found myself a full head and shoulders taller than Polter. And he was tiring, panting heavily. His face was cut and bleeding from the blows of my fist. The rock I heaved struck his shoulder. He roared, head down, and bored into me. He was heavier than I. His weight flung me back. My foot slid on the loose stones of the gully floor. I did not know that Babs, Alan and their father were huddled under those stones!

My back struck the opposite wall. Polter's upflung knee caught me in the stomach, all but knocking the breath out of me. He was desperate, oblivious to the closing walls. And as he flung his arms with a grip about my neck, hanging, trying to bear down, I saw in his blazing dark eyes what seemed the light of suicide. I think that then, with a sudden frenzied madness he realized that he was beaten, and tried to pull us to the ground and let the walls crush us.

I summoned all my remaining strength and heaved us forward. I broke his hold. His body was jammed back against a lowering wall. Its top seemed almost at our knees. I shoved frantically. He fell backward and I jumped after him.

We were on a great rocky plateau. But it was shrinking, crawling into itself. Spots of light were in the murk overhead: there seemed a distant circular horizon of emptiness around us.

Polter was lying in a heap. But it was trickery, for as I incautiously bent over him his hand crashed a rock against my head. I reeled, with all the world turning black, but didn't fall. There was a terrible instant when my senses were going, but I fought to hold them. Blood from a wound on my forehead was streaming in my eyes. I was staggering. Then I realized that I was grimly tossing my head, shaking the blood away; and little by little my sight came back.

Polter was on his feet, rushing me. His fist came with an upward swing at my chin, but I ducked.

And suddenly, fighting up there in the open, my mind envisioned how gigantic we were! This was a great upland plateau, rounded with miles of distance and shadowy dimly radiant abyss beyond its circular horizon.

And I was a thousand feet or more tall! A t.i.tan, looming here in the sky!

My fist quite unexpectedly caught Polter's jaw. His simultaneous swing went wild, as I leapt backward from it. He staggered, and his arms dropped to his sides. I was crouched forward, guarded, watching him while I gasped for breath. There was the briefest of instant when an expression of vague surprise swept his face. But I had not knocked him out.

It was death overtaking him. His heart was yielding, overtaxed from the strain; and I think that there, at the last, he realized it. The blood drained suddenly from his face and lips, leaving them livid. I saw fear, then a wild horror in his eyes. He stood swaying. Then his knees gave way and he toppled. He fell from his height in the air where I stood gazing at him--fell forward on his face, his t.i.tanic length spread all across the top of this rocky landscape!

For a moment I did not move. My head was reeling, my ears roaring.

Blood streamed into my eyes. I wiped it away with a torn sleeve and stood panting, gazing at the glowing distance around me.

I was a t.i.tan, standing there. The body of Polter was shrinking at my feet. The circular abyss of emptiness came nearer as this rocky eminence contracted.

Suddenly my attention went to the sky overhead. Vague distant lights were there. Then a broad flat blur seemed spread over me. Light everywhere was growing. Beyond the nearby brink of the abyss was a white reflected radiance from beneath. Abruptly I realized there was a level, flat white plain running far off there in the distance.

Overhead a radiance contracted into a spot of light. A shape in the sky moved! I heard a faraway rumble--a human voice!

The body of Polter lay at my feet. It was hardly the length of my forearm. I stood, a t.i.tan.

And then, with a shock of realization, I saw how tiny I was! This was the broken top of that fragment of golden quartz the size of a walnut! I was standing there, under the lens of the giant microscope in Polter's dome-room laboratory, with half a dozen astounded Quebec police officials peering down at me!

CHAPTER XII

I need not detail the aftermath of our emergence from the atom. Dr. Kent and Babs followed me out within a few moments. But Alan was not with them! He had seen Polter fall. His father and Babs were safe. The sacrifice he had made in leaving Glora was no longer needed.

Down there on the rocky plateau, Dr. Kent suddenly realized that Alan was dwindling.

"Father, I have to! Don't you understand? Glora's world is menaced. I can't leave her like this. My duty to you and Babs is ended. I did my best. You two are safe now."

"Alan! You can't go!"

He was already down at Dr. Kent's waist, Babs' size. He held up his hand. "Dad, don't try to stop me. Good-bye." His rugged youthful face was flushed, his voice choked. "You--you've been a mighty good father to me. Always."

Babs flung her arms about him. "Alan. Don't!"

"But I must." He smiled whimsically as he kissed her. "You wouldn't want to leave George, would you? Never see him again? I'm not asking you to do that, am I?"

"But, Alan--"

"You've been a great little pal, Babs. But I have to go."

"Alan! You talk as though you were never coming back!"

"Do I? But of course I'm coming back!" He cast her off. "Babs, listen.

Father's upset. That's natural. You tell him not to worry. I'll be careful, and do what I can to save that little city. I must find Glora and--"

Babs was suddenly trembling with eagerness for him. "Yes! Of course you must, Alan!"

"I'll find her and bring her out here! I'll do it! Don't you worry." He was dwindling fast. Dr. Kent had collapsed to a rock, staring down with horror-stricken eyes. Alan called up to Babs:

"Listen! Have George watch the chunk of gold quartz. Have it guarded and watched day and night. Handle it carefully, Babs!"

"Yes! Yes! How long will you be gone, Alan?"

"How do I know? But I'll come back--don't worry. Maybe in only a day or two of your time."

"Right! Good-bye, Alan!"

"Good-bye," his tiny voice echoed up.

Babs could see his miniature face smiling up at her. She smiled back and waved her arm as he vanished into the pebbles at her feet.