Phillips smiled and turned up his hands in a gesture of frank wonder.

"Professor Lambert," he said, "I can't believe what I have seen myself. If I told such a yarn to the reporters, they'd never forget it. They'd kid me out of the department."

"Aw, they were hidin' in a closet," growled Doherty. "Come on, we've wasted too much time on this job already. Just a couple of nuts, says I."

The sleuths, after Phillips had shaken hands with Lambert, left the laboratory. Morgan, a large man of middle age, joined them in a meal which Felix served to the three on a folding table brought in for the purpose. Felix was terribly glad to see Madge and Lambert again, and manifested his joy by many bobs and leaps as he waited upon them. A grin spread across his face from ear to ear.

Morgan asked innumerable questions. They described as best they could what they could recall of the strange dominion in which they had been, and the physicist listened intently.

"It is some h.e.l.l's Dimension, as you call it," he said at last.

"Where it is, or exactly what, I cannot say," said Lambert. "I surely have no desire to return to that world of hate."

Madge, happy now, smiled at him and he leaned over and kissed her tenderly.

"We have come from h.e.l.l, together," said Lambert, "and now we are in Heaven!"

[Ill.u.s.tration: Advertis.e.m.e.nt]

The World Behind the Moon

_By Paul Ernst_

[Ill.u.s.tration: _They fell, for hours, into a deep chasm._]

[Sidenote: Two intrepid Earth-men fight it out with the horrific monsters of Zeud's frightful jungles.]

Like pitiless jaws, a distant crater opened for their ship.

Helplessly, they hurtled toward it: helplessly, because they were still in the nothingness of s.p.a.ce, with no atmospheric resistance on which their rudders, or stern or bow tubes, could get a purchase to steer them.

Professor Dorn Wichter waited anxiously for the slight vibration that should announce that the projectile-shaped sh.e.l.l had entered the new planet's atmosphere.

"Have we struck it yet?" asked Joyce, a tall blond young man with the shoulders of an athlete and the broad brow and square chin of one who combines dreams with action. He made his way painfully toward Wichter. It was the first time he had attempted to move since the sh.e.l.l had pa.s.sed the neutral point--that belt midway between the moon and the world behind it, where the pull of gravity of each satellite was neutralized by the other. They, and all the loose objects in the sh.e.l.l, had floated uncomfortably about the middle of the chamber for half an hour or so, gradually settling down again; until now it was possible, with care, to walk.

"Have we struck it?" he repeated, leaning over the professor's shoulder and staring at the resistance gauge.

"No." Absently Wichter took off his spectacles and polished them.

"There's not a trace of resistance yet."

They gazed out the bow window toward the vast disc, like a serrated, pock-marked plate of blue ice, that was the planet Zeud--discovered and named by them. The same thought was in the mind of each. Suppose there were no atmosphere surrounding Zeud to cushion their descent into the hundred-mile crater that yawned to receive them?

"Well," said Joyce after a time, "we're taking no more of a chance here than we did when we pointed our nose toward the moon. We were almost sure that was no atmosphere there--which meant we'd nose dive into the rocks at five thousand miles an hour. On Zeud there might be anything." His eyes shone. "How wonderful that there should be such a planet, unsuspected during all the centuries men have been studying the heavens!"

Wichter nodded agreement. It was indeed wonderful. But what was more wonderful was its present discovery: for that would never have transpired had not he and Joyce succeeded in their attempt to fly to the moon. From there, after following the sun in its slow journey around to the lost side of the lunar globe--that face which the earth has never yet observed--they had seen shining in the near distance the great ball which they had christened Zeud.

Astronomical calculations had soon described the mysterious hidden satellite. It was almost a twin to the moon; a very little smaller, and less than eighty thousand miles away. Its rotation was nearly similar, which made its days not quite sixteen of our earthly days. It was of approximately the weight, per cubic mile, of Earth. And there it whirled, directly in a line with the earth and the moon, moving as the moon moved so that it was ever out of sight beyond it, as a dime would be out of sight if placed in a direct line behind a penny.

Zeud, the new satellite, the world beyond the moon! In their excitement at its discovery, Joyce and Wichter had left the moon--which they had found to be as dead and cold as it had been surmised to be--and returned summarily to Earth. They had replenished their supplies and their oxygen tanks, and had come back--to circle around the moon and point the sharp prow of the sh.e.l.l toward Zeud. The gift of the moon to Earth was a dubious one; but the gift of a possibly living planet-colony to mankind might be the solution of the overcrowded conditions of the terrestial sphere!

"Speed, three thousand miles an hour," computed Wichter. "Distance to Zeud, nine hundred and eighty miles. If we don't strike a few atoms of hydrogen or something soon we're going to drill this nearest crater a little deeper!"

Joyce nodded grimly. At two thousand miles from Earth there had still been enough hydrogen traces in the ether to give purchase to the explosions of their water-motor. At six hundred miles from the moon they had run into a spa.r.s.e gaseous belt that had enabled them to change direction and slow their speed. They had hoped to find hydrogen at a thousand or twelve hundred miles from Zeud.

"Eight hundred and thirty miles," commented Wichter, his slender, bent body tensed. "Eight hundred miles--ah!"

A thrumming sound came to their ears as the sh.e.l.l quivered, imperceptibly almost, but unmistakeably, at the touch of some faint resistance outside in s.p.a.ce.

"We've struck it, Joyce. And it's much denser than the moon's, even as we'd hoped. There'll be life on Zeud, my boy, unless I'm vastly mistaken. You'd better look to the motor now."

Joyce went to the water-motor. This was a curious, but extremely simple affair. There was a gla.s.s box, ribbed with polished steel, about the size and shape of a cigar box, which was full of water.

Leading away from this, to the bow and stern of the sh.e.l.l, were two small pipes. The pipes were greatly thickened for a period of three feet or so, directly under the little tank, and were braced by bed-plates so heavy as to look all out of proportion. Around the thickened parts of the pipes were coils of heavy, insulated copper wire. There were no valves nor cylinders, no revolving parts: that was all there was to the "motor."

Joyce didn't yet understand the device. The water dripped from the tank, drop by drop, to be abruptly disintegrated, made into an explosive, by being subjected to a powerful magnetic field induced in the coils by a generator in the bow of the sh.e.l.l. As each drop of water pa.s.sed into the pipes, and was instantaneously broken up, there was a violent but controlled explosion--and the sh.e.l.l was kicked another hundred miles ahead on its journey. That was all Joyce knew about it.

He threw the bow switch. There was a soft shock as the motor exhausted through the forward tube, slowing their speed.

"Turn on the outside generator propellers," ordered Wichter. "I think our batteries are getting low."

Joyce slipped the tiny, slim-bladed propellers into gear. They began to turn, slowly at first in the almost non-existent atmosphere.

"Four hundred miles," announced Wichter. "How's the temperature?"

Joyce stepped to the thermometer that registered the heat of the outer wall. "Nine hundred degrees," he said.

"Cut down to a thousand miles an hour," commanded Wichter. "Five hundred as soon as the motor will catch that much. I'll keep our course straight toward this crater. It's in wells like that, that we'll find livable air--if we're right in believing there is such a thing on Zeud."

Joyce glanced at the thermometer. It still registered hundreds of degrees, though their speed had been materially reduced.

"I guess there's livable air, all right," he said. "It's pretty thick outside already."

The professor smiled. "Another theory vindicated. I was sure that Zeud, swinging on the outside of the Earth-moon-Zeud chain and hence traveling at a faster rate, would pick up most of the moon's atmosphere over a period of millions of years. Also it must have been shielded by the moon, to some extent, against the constant small atmospheric leakage most celestial globes are subject to. Just the same, when we land, we'll test conditions with a rat or two."

At a signal from him, Joyce checked their speed to four hundred miles an hour, then to two hundred, and then, as they descended below the highest rim of the circular cliffs of the crater, almost to a full stop. They floated toward the surface of Zeud, watching with breathless interest the panorama that unfolded beneath them.

They were nosing toward a spot that was being favored with the Zeudian sunrise. Sharp and clear the light rays slanted down, illuminating about half the crater's floor and leaving the cliff protected half in dim shadow.