“Nothing ever happens to me!” Larry Manahan grumbled under his breath, sitting behind his desk at the advertising agency which employed his services in return for the consideration of fifty a week. “All the adventure I know is what I see in the movies, or read about in magazines. What wouldn’t I give for a slice of real life!”

Unconsciously, he tensed the muscles of his six feet of lean, hard body. His crisp, flame-colored hair seemed to bristle; his blue eyes blazed. He clenched a brown hammer of a fist.

Larry felt himself an energetic, red-blooded square peg, badly afflicted with the urge for adventure, miserably wedged in a round hole. It is one of the misfortunes of our civilization that a young man who, for example, might have been an excellent pirate a couple of centuries ago, must be kept chained to a desk. And that seemed to be Larry’s fate.

“Things happen to other people,” he muttered. “Why couldn’t an adventure come to me?”

He sat, staring wistfully at a picture of a majestic mountain landscape, soon to be used in the advertising of a railway company whose publicity was handled by his agency, when the jangle of the telephone roused him with a start.

“Oh, Larry--” came a breathless, quivering voice.

Then, with a click, the connection was broken.

The voice had been feminine and had carried a familiar ring. Larry tried to place it, as he listened at the receiver and attempted to get the broken connection restored.

“Your party hung up, and won’t answer,” the operator informed him.

He replaced the receiver on the hook, still seeking to follow the thin thread of memory given him by the familiar note in that eager excited voice. If only the girl had spoken a few more words!

Then it came to him.

“Agnes Sterling!” he exclaimed aloud.

Agnes Sterling was a slender, elfish, dark-haired girl--lovely, he had thought her, on the occasions of their few brief meetings. Larry knew her as the secretary and laboratory assistant of Dr. Travis Whiting, a retired college professor known for his work on the structure of the atom. Larry had called at the home-laboratory of the savant, months before, to check certain statistics to be used for advertising purposes and had met the girl there. Only a few times since had he seen her.

Now she had called him in a voice that fairly trembled with excitement--and, he thought, dread! And she had been interrupted before she had time to give him any message.

For a few seconds Larry stared at the telephone. Then he rose abruptly to his feet, crammed his hat on his head, and started for the door.

“The way to find adventure is to go after it,” he murmured. “And this is the invitation!”

It was not many minutes later that he sprang out of a taxi at the front of the building in which Dr. Travis Whiting made his home and maintained a private experimental laboratory. It was a two-story stucco house, rather out of date, set well back from the sidewalk, with a scrap of lawn and a few straggling shrubs before it. The door was closed, the windows curtained blankly. The place seemed deserted and forbidding.

Larry ran up the uneven brick walk to the door and rang the bell. Impatiently, he waited a few moments. No sound came from within. He felt something ominous, fateful, about the silent mystery that seemed to shroud the old house. For the first time, it occurred to him that Agnes might be in physical danger, as a result of some incautious experiment on the part of Dr. Whiting.

Instinctively, his hand sought the door knob. To his surprise, the door was unlocked. It swung open before him. For a moment he stared, hesitating, into the dark hall revealed beyond. Then, driven by the thought that Agnes might be in danger, he advanced impulsively.

The several doors opening into the hall were closed. The one at the back, he knew, gave admittance to the laboratory. Impelled by some vague premonition, he hastened toward it down the long hall and threw it open.

As he stepped inside the room, his foot slipped on a spot of something red. Recovering his balance with difficulty, he peered about.

Bending down, Larry briefly examined the red spot on which he had slipped. It was a pool of fresh blood which had not yet darkened. Lying beside it, crimson-splashed, was a revolver. As he picked up the weapon, he cried out in astonishment.

Something had happened to the gun. The trigger guard was torn from it, and the cylinder crushed as if in some resistless grasp; the stock was twisted, and the barrel bent almost into a circle. The revolver had been crumpled by some terrific force--as a soft clay model of it might have been broken by the pressure of a man’s hand.

“Crimson shades of Caesar!” he muttered, and dropped the crushed weapon to the floor again.

His eyes swept the silent laboratory.

It was a huge room, taking up all the rear part of the house, from the first floor to the roof. Gray daylight streamed through a sky-light, twenty feet overhead. The ends of the vast room were cluttered with electrical and chemical apparatus; but Larry’s eye was caught at once by a strange and complex device, which loomed across from him, in the center of the floor.

Two pillars of intense light, a ray of crimson flame and another of deeply violet radiance, beat straight down from a complicated array of enormous, oddly shaped electron tubes, of mirrors and lenses and prisms, of coils and whirling disks, which reached almost to the roof. Upright, a yard in diameter and almost a yard apart, the strange columns of light were sharp-edged as two transparent cylinders filled with liquid light of ruby and of amethyst. Each ray poured down upon a circular platform of glass or polished crystal.

Hanging between those motionless cylinders of red and violet light was a strange-looking, greenish globe. A round ball, nearly a yard in diameter, hung between the rays, almost touching them. Its surface was oddly splotched with darker and lighter areas. It was spinning steadily, at a low rate of speed. Larry did not see what held it up; it seemed hanging free, several feet above the crystal platforms.

Reluctantly he withdrew his eyes from the mysterious sphere and looked about the room once more. No, the laboratory was vacant of human occupants. No one was hidden among the benches that were cluttered with beakers and test tubes and stills, or among the dynamos and transformers in the other end of the room.

A confusion of questions beat through Larry’s brain.

What danger could be haunting this quiet laboratory? Was this the blood of Agnes Sterling or the scientist who employed her that was now clotting on the floor? What terrific force had crumpled up the revolver? What had become of Agnes and Dr. Whiting? And of whatever had attacked them? Had Agnes called him after the attack, or before?

Despite himself, his attention was drawn back to the little globe spinning so regularly, floating in the air between the pillars of red and violet flame. Floating alone, like a little world in space, without a visible support, it might be held up by magnetic attraction, he thought.

A tiny planet!

His mind quickened at the idea, and he half forgot the weird mystery gathering about him. He stepped nearer the sphere. It was curiously like a miniature world. The irregular bluish areas would be seas; the green and the brown spaces land. In some parts, the surface appeared mistily obscured--perhaps, by masses of cloud.

Larry saw an odd-looking lamp, set perhaps ten feet behind the slowly spinning, floating ball, throwing upon it a bright ray of vividly blue light. Half the strange sphere was brilliantly illuminated by it; the rest was in comparative darkness. That blue lamp, it came to Larry, lit the sphere as the sun lights the earth.

“Nonsense!” he muttered. “It’s impossible!”

Aroused by the seeming wonder of it, he was drawn nearer the ball. It spun rather slowly, Larry noted, and each rotation consumed several seconds. He could distinguish green patches that might be forests, and thin, silvery lines that looked like rivers, and broad, red-brown areas that must be deserts, and the broad blue stretches that suggested oceans.

“A toy world!” he cried. “A laboratory planet! What an experiment--”

Then his eyes, looking up, caught the glistening, polished lens of a powerful magnifying glass which hung by a black ribbon from a hook on one of the heavy steel beams which supported the huge mass of silently whirring apparatus.

Eagerly, he unfastened the magnifier. Holding it before his eyes, he bent toward the strange sphere spinning steadily in the air.

“Suffering shades of Caesar!” he ejaculated.

Beneath the lens a world was racing. He could see masses of vividly green forest; vast expanses of bare, cracked, ocherous desert; wastes of smooth blue ocean.

Then he was gazing at--a city?

Larry could not be sure that he had seen correctly. It had slipped very swiftly beneath his lens. But he had a momentary impression of tiny, fantastic buildings, clustered in an elflike city.

A pygmy planet, spinning in the laboratory like a world in the gulf of space! What could it mean? Could it be connected with the strange call from Agnes, with the blood on the floor, with the strange and ominous silence that shrouded the deserted room?

“Oh, Larry!” a clear, familiar voice rang suddenly from the door. “You came!”

Startled, Larry leaped back from the tiny, whirling globe and turned to the door. A girl had come silently into the room. It was Agnes Sterling. Her dark hair was tangled. Her small face was flushed, and her brown eyes were wide with fear! In a white hand, which shook a little, she carried a small, gold-plated automatic pistol.

She ran nervously across the wide floor to Larry, with relief dawning in her eyes.

“I’m so glad you came!” she gasped, panting with excitement. “I started to call you on the phone, but then I was afraid it would kill you if you came! Please be careful! It may come back, any minute! You’d better go away! It just took Dr. Whiting!”

“Wait a minute,” Larry put in. “Just one thing at a time. Let’s get this straight. To begin with, what is it that might kill me, and that got the doctor?”

“It’s terrible!” she gasped, trembling. “A monster! You must go away before it comes back!”

Larry drew a tall stool from beside one of the crowded tables and placed it beside her.

“Don’t get excited,” he urged. “I’m sure everything will be all right. Just sit down, and tell me about it. The whole story. Just what is going on here, and what happened to Dr. Whiting.”

He helped her upon the stool. She looked up at him gratefully, and began to speak in a rapid voice.

“You see that little planet? The monster came from that and carried the doctor back there. And I know it will soon be back for another victim--for sacrifice!”

She had pointed across the great room, toward the strange little globe which hung between the pillars of red and violet light.

“Please go slow!” Larry broke in. “You’re too fast for me. Are you trying to tell me that that spinning ball is really a planet?”

Agnes seemed a little more composed, though she was still flushed and breathing rapidly. Her small hand still gripped the bright automatic.

“Yes, it is a planet. The Pygmy Planet, Dr. Whiting called it. He said it was the great experiment of the century. You see, he was testing evolution. We began with the planet, young and hot, and watched it until it is now almost as old as Mars. We watched the change and development of life upon it. And the rise and decay of a strange civilization. Until now its people are strange things, with human brains in mechanical bodies, worshiping a rusty machine like a god--”

“Go slow!” Larry pleaded again. “I don’t see--Did the doctor build--create--that planet himself?”

“Yes. It began with his work on atomic structure. He discovered that certain frequencies of the X-ray--so powerful that they are almost akin to the cosmic ray--have the power of altering electronic orbits. Every atom, you know, is a sort of solar system, with electrons revolving about a proton.

“And these rays would cause the electrons to fall into incredibly smaller orbits, causing vast reduction in the size of the atoms, and in the size of any object which the atoms formed. They would cause anything, living or dead, to shrink to inconceivably microscopic dimensions--or restore it to its former size, depending upon the exact wave-length used.

“And time passes far more swiftly for the tiny objects--probably because the electrons move faster in their smaller orbits. That is what suggested to Dr. Whiting that he would be able to watch the entire life of a planet, in the laboratory. And so, at first, we experimented merely with solitary specimens or colonies of animals.

“But on the Pygmy Planet, we have watched the life of a world--the whole panorama of evolution--”

“It seems too wonderful!” Larry muttered. “Could Dr. Whiting actually decrease his size and become a dwarf?”

“No trick at all,” Agnes assured him. “All you have to do is stand in the violet beam, to shrink. And move over in the red one, when you want to grow. I have been several times with Dr. Whiting to the Pygmy Planet.”

“Been--” Larry stopped, breathless with astonishment.

“See the little airplane,” Agnes said, pointing under the table.

Larry gasped.

Beneath the table stood a toy airplane. The spread of its glistening, perfect wings was hardly three feet. A wonderful, delicate toy, accurate in every detail of propeller, motor and landing gear, of brace and rudder and aileron. Then he realized that it was no toy at all, but a faithful miniature of a commercial plane. A complete, tiny copy of one of the latest single-motor, cabin monoplane models.

“It looks like it would fly,” he said “a friend of mine his a big one, just like it! Taught me to fly it, last summer vacation. This is the very image of it!”

“It will fly!” Agnes assured him, now composed enough to smile at his amazement. “I have been with the doctor to the Pygmy Planet in it.

“You stand in the violet ray until you’re about three inches high,” she explained, “and then get into the plane. Then you fly up and into the violet ray at the point where it touches the planet, and remain there while you grow smaller. When you are the right size, all you have to do is drop to the surface, and land. To come away, you rise into the red ray and stay in it till you grow to proper size, when you come down and land.”

“You--you’ve actually done that?” he gasped. “It sounds like a fairy story!”

“Yes, I’ve done it,” she assured him. Then she shuddered apprehensively. “And the things--the machine-monsters, Dr. Whiting called them--have learned to do it, too. One of them came down the red ray, and attacked him. The doctor had a gun--but what could he do against one of those?” She shivered.

“It carried him back up the violet beam. Just a few minutes ago, I started to phone you. Then I was afraid you would be hurt--”

“Me, hurt?” Larry burst out. “What about you, here alone?”

“It was my business. Dr. Whiting told me there might be danger, when he hired me.”

“And now, what can we do?” Larry demanded.

“I don’t know,” she said slowly. “I’m afraid one of the monsters will be back after a new victim. We could smash the apparatus, but it is too wonderful to be destroyed. And besides, Dr. Whiting may have escaped. He may be alive there, in the deserts!”

“We might fly up, in the little plane,” Larry proposed, doubtfully. “I think I could pilot it. If you want--”

The girl’s body stiffened. Her brown eyes widened with sudden dread, and her small face went pale. She slipped quickly from the stool, drawing in her breath with a sort of gasp. The hand that gripped the automatic trembled a little.

“What’s the matter?” Larry cried.

“I thought--” she gasped, “I think I see something in the ray! The machine-monster is coming back!”

Her lips tightened. She lifted the little automatic and began to shoot into the pillar of crimson fire beside the tiny, spinning globe.

Larry, watching tensely, saw a curious, bird-like something fluttering about in the red ray, swiftly growing larger!

Deliberately, and pausing to aim carefully for each shot, the girl emptied the little gun at the figure. Her body was rigid, her small face was firmly set, though she was breathing very fast.

A curious numbness had come over Larry. His only physical sensations were the quick hammering of his heart, and a parching dryness in his throat. Terror stiffened him. Though he would not have admitted it, he was paralyzed with fear.

The glittering thing that fluttered about in the crimson ray was not an easy target. When the gun was empty, it seemed still unharmed. And its wings had increased to a span of a foot.

“Too late!” Agnes gasped. “Why didn’t we do something?”

Trembling, horror-stricken, she shrank toward Larry.

He was staring at the thing in the pillar of scarlet light.

It had dropped to the crystal disk upon which the red ray fell from the huge, glowing tube above. It stood there, motionless except for the swift increase of its size.

Larry gazed at it, lost in fear and wonder. It was like nothing he had ever seen. What was it that Agnes had said, of machine-monsters, of human brains in mechanical bodies? His brain reeled. He strained his eyes to distinguish the monstrosity more clearly. It was veiled in crimson flame; he could not see it distinctly.

But suddenly, when it was as tall as himself, it sprang out into the room, toward Larry and the shuddering girl. Just off the crystal disk, beyond the scarlet pillar of fire, it paused for long seconds, seeming to regard them with malevolent eyes.

For the first time, Larry could see it plainly.

Its body, or its central part, was a tube of transparent crystal; an upright cylinder, rounded at upper and lower ends. It was nearly a foot in diameter, and four feet long. It seemed filled with a luminous, purple liquid.

About the cylinder were three bands of greenish, glistening metal. Attached to the lower band were four jointed legs of the same bright green metal, upon which the strange thing stood.

Set in the middle band were two glittering, polished lenses, which seemed to serve as eyes, and Larry felt that they were gazing at him with malevolent menace. Behind the eyes, two wings sprang from the green band. Ingenious, folding wings, of thin plates and bars of green metal.

And from the upper band sprang four slender, glistening, whip-like tentacles, metallic and brilliantly green, two yards in length. They writhed with strange life!

It seemed a long time to Larry that the thing stood, motionless, seeming to stare evilly at them with eye-like lenses. Then, lurching forward a little, it moved toward them upon legs of green metal. And now Larry saw another amazing thing about it.

Floating in the brilliant violet liquid that filled the crystal tube was a gray mass, wrinkled and corrugated. This was divided by deep clefts into right and left hemispheres, which, in turn were separated into larger upper and smaller lower segments. White filaments ran through the violet liquid from its base toward the three rings or bands of green metal that encircled the cylinder.

In an instant, Larry realized that the gray mass was a human brain. The larger, upper part the cerebrum, the smaller mass at the back the cerebellum. And the white filaments were nerves, by means of which this brain controlled its astounding, mechanical body!

A brain in a machine!

The violet liquid, it came to Larry in his trance of wonder, must take the place of blood, feeding the brain-cells, absorbing waste.

An eternal mind, within a machine! Free from the ills and weaknesses of the body. And devoid, too, of any pity, of any tender feelings. A cold and selfish mind, without emotion--unless it might worship itself or its mechanical body.

It was this monster that had spilt the pool of blood drying on the floor, near the door. And it was these glistening, green, snake-like tentacles that had crumpled the revolver into a broken mass of steel!

Abruptly the machine-monster darted forward, running swiftly upon its four legs of green metal. Slender tentacles reached out toward the shuddering girl at Larry’s shoulder.

“Run!” Agnes gasped to him, quickly. “It will kill you!”

The girl tried to push him back.

As she touched him, Larry recovered from his daze of wondering fear. Agnes was in frightful danger, and facing it with quiet courage. He must find a weapon!

Wildly, he looked about him. His eyes fell upon the tall, heavy wooden stool, upon which Agnes had been sitting.

“Get back!” he shouted to her.

He snatched up the stool, and, swinging it over his head, sprang toward the machine of violet-filled crystal and glittering green metal.

“Stop!” Agnes screamed, in a terrified voice. “You can’t--”

She had run before him. He seized her arm and swung her back behind him. Then he advanced warily toward the machine-monster, which had paused and seemed to be regarding him with sinister intentness, through its glistening crystal eye-lenses.

With all his strength, Larry struck at the crystal cylinder, swinging the stool like an ax. A slender, metallic green tentacle whipped out, tore the stool from his hands, and sent it crashing across the room, to splinter into fragments on the opposite wall.

Larry, sent off his balance, staggered toward the glittering machine. As he stumbled against the transparent tube that contained the brain, he clenched his fist to strike futilely at it.

A snake-like metal tentacle wrapped itself about him; he was hurled to the floor, to sprawl grotesquely among broken apparatus.

His head came against the leg of a bench. For a few moments he was dazed. But it seemed only a few seconds to him before he had staggered to his feet, rubbing his bruised head. Anxiously, he peered about the room.

The machine-monster and Agnes were gone!

He stumbled back to the mass of apparatus in the center of the huge laboratory. Intently, he gazed into the upright pillar of crimson flame. Nothing was visible there.

“No, the other!” he gasped. “The violet is the way they went.”

He turned to the companion ray of violet radiance that beat straight down on the opposite side of the tiny, whirling planet. And in that motionless torrent of chill violet flame he saw them.

Tiny, already, and swiftly dwindling!

With green wings outspread, the machine-monster was beating swiftly upward through the pillar of purple-blue flame. And close against the crystal tube that contained its brain, was Agnes, held fast by the whip-like tentacles of glistening green metal.

Larry moved to spring after them, into the torrent of violet light. But sudden caution restrained him.

“I’d shrink, too!” he muttered. “And then where would I be? I’d be standing on the glass platform, I guess. And the thing flying off over my head!”

He gazed at the rapidly dwindling forms of Agnes Sterling and her amazing abductor. As it grew smaller, the machine-monster flew higher in the violet beam, until it was opposite the tiny, spinning planet.

The distance between the red and the violet rays was just slightly more than the diameter of the pygmy world. The sphere hung between them, one side of it a fraction of an inch from the red, the other as near the violet.

Opposite the elfin planet, the monster ceased to climb. It hung there in the violet ray, an inch from the surface of the little world.

And still it swiftly dwindled. It was no larger than a fly, and Larry could barely distinguish the form of the girl, helpless in the green tentacles.

Soon she and the monster became a mere greenish speck ... Suddenly they were gone.

For a little time he stood watching the point where they had vanished, watching the red and the violet rays that poured straight down upon the crystal disks, watching the tiny, green-blue planet spinning so steadily between the bright rays.

Abruptly, he recovered from his fascination of wonder.

“What did she say?” he muttered. “Something about the monsters carrying off people to sacrifice to a rusty machine that they worship as a god! It took her--for that!”

He clenched his fists; his lips became a straight line of determination.

“Then I guess we try a voyage in the little plane. A slim chance, maybe. But decidedly better than none!”

He returned to the table, dropped on his knees, inspected the tiny airplane. A perfect miniature, delicately beautiful; its slim, small wings were bright as silver foil. Carefully, he opened the door and peered into the diminutive cabin. Two minute rifles, several Lilliputian pistols, and boxes of ammunition to match, lay on the rear seat of the plane.

“So we are prepared for war,” he remarked, grinning in satisfaction. “And the next trick, I suppose, is to get shrunk to fit the plane. About three inches, she said. Lord, it’s a queer thing to think about!”

He got to his feet, walked back to the machine in the center of the room, with its twin pillars of red and violet flame, and the tiny world floating between them. He started to step into the violet ray, then hesitated, shivering involuntarily, like a swimmer about to dive into icy cold water.

Turning back to one of the benches, he picked up a wooden funnel-rack, and tossed it to the crystal disk beneath the violet ray. Slowly it decreased in size, until it had vanished from sight.

“Safe, I suppose,” he muttered. “But how do I know when I’m small enough?”

After a moment he picked up a glass bottle which measured about three inches in height, set it on the floor, beside the crystal disk.

“I dive out when I get to be the size of the bottle,” he murmured.

With that, he leaped into the violet beam.

He felt no unusual sensation, except one of pleasant, tingling warmth, as if the direct rays of the sun were bearing down upon him. For a moment he feared that his size was not being affected. Then he noticed, not that he appeared to become smaller, but that the laboratory seemed to be growing immensely larger.

The walls seemed to race away from him. The green-blue sphere of the tiny planet which he proposed to visit expanded and drew away above his head.

Abruptly fearful, alarmed at the hugeness of the room, he turned to look at the bottle he had placed to serve as a standard of size. It had grown with everything else, until it seemed to be about three feet high.

And it was swiftly expanding. It reached to the level of his shoulder. And higher!

He ran to the edge of the crystal disk, which now seemed a floor many yards across, and leaped from its edge. It was a dozen steps to where he had left the bottle. And it was as tall as himself!

He started across the floor of the laboratory toward the table under which the toy plane stood. The incredible immensity of his surroundings awed him strangely. The walls of the room seemed distant, Cyclopean cliffs; the roof was like a sky. Table legs towered up like enormous columns.

It seemed a hundred yards across the strangely rough floor to the plane. As he drew near it, it gave him huge satisfaction to see that it was of normal size, correctly proportioned to his own dimensions.

“Great luck,” he muttered, “that I can fly!”

He paused, as he reached the cabin’s open door, to wonder at the astounding fact that a little while ago he had opened that door with a hand larger than his entire body now was.

“I guess this is my day of wonders!” he muttered. “Allah knows I had to wait long enough for it!”

First he examined the weapons in the cabin. There were two heavy sporting rifles and two .45 automatics. There were also two smaller automatics, which, he supposed, had been intended for Agnes’ use. And there was abundant ammunition.

Then he inspected the plane. It looked to be in excellent condition in every way. The gasoline and oil tanks were full.

He set about starting the motor, using the plane’s inertia starter, which was driven by an electric motor. Soon the engine coughed, sputtered, and gave rise to a roaring, rhythmic note that Larry found musical.

When the motor was warm, he opened the throttle and taxied out from beneath the colossal table, and across the laboratory floor toward the Titanic mechanism in the center of the room. The disk of crystal was set almost flush with the floor, its edge beveled. The plane rolled easily upon it, and out into the Cyclopean pillar of violet flame.

Once more, Larry felt the sensation that everything about him except the plane itself, was expanding inconceivably in size. Soon the laboratory’s walls and roof were lost in hazy blue distance. He could distinguish only the broad, bright field formed by the surface of the crystal disk, with the floor stretching away beyond it like a vast plain. And above, the green-blue sphere of the tiny planet, bright on one side and dark on the other, so that it looked like a half-moon, immensely far-off.