She walked around the ma.s.sive base of the great machine, carrying a bowl filled with a fragrant brown liquid. She stopped at sight of Larry, and uttered a little cry. The bowl fell from her hands, and the fragrant liquid splashed out on the ground. Her brown eyes went wide with delighted surprise; then a look of pain came into them.

"Larry, Larry!" she cried. "Why did you come?"

"To get you," he answered, trying to speak as lightly as he could.

"And the best way I knew to find you was to let one of the monsters bring me. Cheer up!" But even to himself, his voice had a tone of discouragement.

She smiled wanly. "I don't see anything to be cheerful about." Her small face was set and a little white. "Dr. Whiting is going to be smashed under the hammer of this dreadful machine, whenever the steam is up. Then it is my turn. And yours. That's nothing to laugh about."

"But we aren't smashed yet!" Larry insisted.

"By the way, what was that in the bowl?" he went on, glancing down. "I forgot to bring lunch." He grinned.

She looked down, startled.

"Oh. Dr. Whiting's soup. Poor fellow, I'm afraid he'll never awake to eat it. There's plenty more. Come around here."

She picked up the bowl and led him around the base of the machine; then she filled the bowl again with the fragrant, red-brown liquid, from a tall urn of green metal. Larry took the dish eagerly and gulped down the rather insipid and tasteless food.

"And the monsters worship this old steam hammer?" he inquired, when his hunger was appeased.

"Yes. I think the thing is worked by steam generated by volcanic heat.

Anyhow, there isn't any boiler, and the steam pipe comes up out of the ground. You can see that. So it runs on, without any attention--though I guess the heat is dying down, since it is several days between blows of the hammer.

"And I guess the monsters have forgotten how they used to rule machines. They seem to have depended upon machines, even giving up their own bodies for mechanical ones, until the machine rules them.

"And when this old hammer kept pounding on through the ages, using volcanic steam, I guess they got to considering it alive. They began to regard it as a sort of G.o.d. And when they got the idea of giving it sacrifices, it was natural enough to place the victims under the hammer."

They went back to Dr. Whiting who was chained across the anvil. He was still breathing, but unconscious. He had been injured in a struggle with the monsters, and his body was much emaciated. Agnes explained that he had been a prisoner in the pen for many months of the time of this world, waiting his turn to die; she said that the monsters had just completed the extermination of another race upon the Pygmy Planet, and were just turning to the greater world for victims.

Larry noticed that the great hammer was slowly rising in its guides, as the pressure of the steam from the planet's interior increased. In a few hours--just at sunset--it reached the top of its stroke.

The air above the pen was suddenly filled with glittering swarms of the green-winged monsters, sweeping slowly about, in measured flight, with strange order in their ma.s.ses. They had come to witness the sacrifice!

With an explosive rush of steam, the hammer came down!

The ground trembled beneath the terrific blow; the roaring of escaping steam and the crash of the impact were almost deafening. A heavy white cloud shrouded the corroded green machine.

When the hammer slowly lifted, only a red smear was left....

Agnes had shrunk, trembling, against Larry's shoulder. He had put his arms about her and was holding her almost fiercely.

"My turn next," she whispered. "And don't try to fight them. It will only make them hurt you!"

"I can't let them take you, Agnes!" Larry cried, in an agonized tone.

And the words seemed to leap out, of themselves, "Because I love you!"

"You do?" Agnes cried, in a thin, choking voice, pressing herself against him. "Ever since the first time you came to the laboratory--"

A score of the monster forms of violet-filled crystal and gleaming green metal had dropped into the pen. They tore Agnes from Larry's arms, hurling him roughly to the ground, at the bottom of the green metal fence. For some time he was unconscious.

When he had staggered painfully to his feet, it was night. The monsters were gone; the starless sky was black and empty. Calling out weakly, and stumbling about the pen, he found Agnes. She was chained where Dr. Whiting had been.

She was conscious, unharmed. For a time they talked a little, exchanging broken, incoherent phrases. Then they went to sleep, lying on the anvil, beneath that mighty hammer that was slowly lifting to strike another fearful blow.

When the "sun" had risen again, Larry brought Agnes some of the brown soup from the metal urn, which had been filled again. Then, when he had satisfied himself, he started clambering up the ma.s.sive frame of the hammer.

If he could put it out of commission!

It was a difficult task. He slipped back many times, and finally had to choose another place to make the ascent. Twice he slipped and almost fell from a considerable height. But finally he reached the ma.s.sive wheel of the valve which seemed to control the admission of steam into the cylinder above the hammer.

If he could but close that, the steam would be confined in the chest below. And when the pressure reached a certain point, something should happen!

The valve was not easy to turn; it seemed fixed with the corrosion of ages. For hours Larry wrestled with it. Then he left it, realizing that he must find something to use for a hammer. A vigorous search of the pen's hard earth floor failed to reveal any stone that would do.

He turned his attention to the machine, and presently saw a slender projecting lever, high up on the side of the vast frame, which looked as if it had been weakened by corrosion. After a perilous climb, he reached the bar of green metal and swung his weight upon it. It broke, and he plunged to the ground with the bar in his hands.

Clambering up once more to the great valve, he hammered it until the rust that stiffened it was loosened. Then he struggled with the valve until it was closed.

"We'll see what happens!" he muttered.

Returning to the ground, he set to work to break the green metal fetters upon Agnes' wrists and ankles, using the broken lever as hammer and file.

For the greater part of six days he toiled at that task, while the great hammer rose slowly. But the green metal seemed very hard. One arm was free at the end of the second day, the other on the fourth. He had one ankle loose on the morning of the sixth day. But as evening came on, and the great hammer reached the top of its stroke, the fourth chain still defied him.

Before sunset, a swarm of the monsters appeared, wheeling on green wings. He was forced to leave the work, hiding his improvised file.

Agnes still lay across the anvil, to conceal from the monsters the fact that the chains were broken. Larry sat close beside her, nursing hands that were blistered and sore from his days of filing at the chains.

A sudden clatter came from the huge mechanism above them, and a sharp hiss of steam, which became louder.

"It works!" Larry whispered to Agnes. "The old valve held, and the steam can't get into the cylinder to smash us! But Allah knows what will happen when the pressure rises in that old steam chest!"

Darkness came. Dusk swallowed the wheeling machine-monsters. All night Larry and Agnes waited silently, together on the great anvil, listening to the hissing of steam from above, which was slowly becoming a shrill monotonous scream; monotonous, always higher, shriller.

The "sun" rose again. Still the green-winged monsters wheeled about.

They came in glittering swarms, thousands of them. They came nearer the machine now, and flew about more swiftly, is if excited.

Then it happened.

There was a roar like thunder, and a colossal, bellowing explosion.

The air was filled suddenly with scalding steam, and with screaming fragments of the bursting steam chest. In the midst of it all, Larry felt a crushing blow upon the head. And a blanket of darkness fell upon him....