underneath. The instrument was printing the news story as rapidly as any voice could speak it.

Harkness read the words for an instant, then let the paper pass on to wind itself upon a spool. It had still been telling of the gigantic hoax that this eccentric American had attempted and Harkness repeated the words.

"A hoax!" he exclaimed, and his eyes, for a moment, flashed angrily beneath the dark hair that one hand had disarranged. "I would like to take that facetious bird out about a thousand miles and let him play around with the serpents we met. But, why get excited? This is all Schwartzmann's doing. The tentacles of that man's influence reach out like those of an octopus."

Chet ranged himself alongside. Tall and slim and blond, he contrasted strongly with this other man, particularly in his own quiet self-control as against Harkness' quick-flaring anger.

"Take it easy, Walt," he advised. "We'll show them. But I judge that you have been razzed a bit. It's a pretty big story for them to swallow without proof. Why didn't you show them the ship? Or why didn't you let Diane and me back up your yarn? And you haven't answered my other questions: when do we go back?"

Harkness took the queries in turn.

"I didn't show the old boat," he explained, "because I'm not ready for that yet. I want it kept dark—dark as the Dark Moon. I want to do my preliminary work there before Schwartzmann and his experts see our ship. He would duplicate it in a hurry and be on our trail.

"And now for our plans. Well, our there in space the Dark Moon is waiting. Have you realized, Chet, that we own that world—you and Diane and I? Small—only half the size of our old moon—but what a place! And it's ours!

"Back in history—you remember?—an ambitious lad named Alexander sighed for more worlds to conquer. Well, we're going Alexander one better—we've found the world. We're the first ever to go out into space and return again.

"We'll go back there, the three of us. We will take no others along—not yet. We will explore and make our plans for development; and we will keep it to ourselves until we are ready to hold it against any opposition.

"And now, how soon can you go? Your injury—how soon will you be well enough?"

"Right now," Chet told him laconically; "today, if you say the word. They've got me welded together so I'll hold, I reckon. But where's the ship? What have you done—" He broke off abruptly to listen—

To all three came a muffled, booming roar. The windows beside them shivered with the thud of the distant explosion; they had not ceased their trembling before Harkness had switched on the news broadcast. And it was a minute only until the news-gathering system was on the air.

"Explosion at the Institute of Physical Science!" it stated. "This is Vienna broadcasting. An explosion has just occurred. We are giving a preliminary announcement only. The laboratories of the Scientific Institute of this city are destroyed. A number of lives have been lost. The cause has not been determined. It is reported that the laboratories were beginning analytical work, on the so-called Harkness Dark Moon gas—

"Confirmation has just been radioed to this station. Dark Moon gas exploded on contact with air. The American, Harkness, is either a criminal or a madman; he will be apprehended at once. This confirmation comes from Herr Schwartzmann of Vienna who left the Institute only a few minutes before the explosion occurred—"

And, in the quiet of a hospital room, Walter Harkness drew a long breath and whispered; "Schwartzmann! His hand is everywhere.... And that sample was all I had.... I must leave at once—go back to America."

He was halfway to the door—he was almost carrying Diane Delacouer with him—when Chet's quiet tones brought him up short.

"I've never seen you afraid," said Chet; and his eyes were regarding the other man curiously; "but you seem to have the wind up, as the old flyers used to say, when it comes to Schwartzmann."

Harkness looked at the girl he held so tightly, then grinned boyishly at Chet. "I've someone else to be afraid for now," he said.

His smile faded and was replaced by a look of deep concern. "I haven't told you about Schwartzmann," he said; "haven't had time. But he's poison, Chet. And he's after our ship."

"Where is the ship; where have you hidden it? Tell me—where?"

Harkness looked about him before he whispered sharply: "Our old shop—up north!"

He seemed to feel that some explanation was due Chet. "In this day it seems absurd to say such things," he added; "but this Schwartzmann is a throw-back—a conscienceless scoundrel. He would put all three of us out of the way in a minute if he could get the ship. He knows we have been to the Dark Moon—no question about that—and he wants the wealth he can imagine is there.

"We'll all plan to leave; I'll radio you later. We'll go back to the Dark Moon—" He broke off abruptly as the door opened to admit the nurse. "You'll hear from me later," he repeated; and hurried Diane Delacouer from the room.

But he returned in a moment to stand again at the door—the nurse was still in the room. "In case you feel like going for a hop," he told Chet casually, "Diane's leaving her ship here for you. You'll find it up above—private landing stage on the roof."

Chet answered promptly, "Fine; that will go good one of these days." All this for the benefit of listening ears. Yet even Chet would have been astonished to know that he would be using that ship within an hour....

He was standing at the window, and his mind was filled, not with thoughts of any complications that had developed for his friend Harkness, but only of the adventures that lay ahead of them both. The Dark Moon!—they had reached it, indeed; but they had barely scratched the surface of that world of mystery and adventure. He was wild with eagerness to return—to see again that new world, blazing brightly beneath the sun; to see the valley of fires—and he had a score to settle with the tribe of ape-men, unless Harkness had finished them off while he, himself, lay unconscious.... Yes, there seemed little doubt of that; Walt would have paid the score for all of them.... He seemed actually back in that world to which his thoughts went winging across the depths of space. The buzz of a telephone recalled him.

It was the hospital office, he found, when he answered. There was a message—would Mr. Bullard kindly receive it on the telautotype—lever number four, and dial fifteen-point-two—thanks.... And Chet depressed a key and adjusted the instrument that had been printing the newscast.

The paper moved on beneath the glass, and the type-bars clicked more slowly now. From some distant station that might be anywhere on or above the earth, there was coming a message.

The frequency of that sending current was changed at some central office; it was stepped down to suit the instrument beside him. And the type was spelling out words that made the watching man breathless and intent—until he tore off the paper and leaped for the call signal that would summon the nurse. Through her he would get his own clothes, his uniform, the triple star that showed his rating and his authority in every air-level of the world.

That badge would have got him immediate attention on any landing field. Now, on the flat roof, with steady, gray eyes and a voice whose very quietness accentuated its imperative commands, Chet had the staff of the hospital hangars as alert as if their alarm had sounded a general ambulance call.

Straight into the sky a red beacon made a rigid column of light; a radio sender was crackling a warning and a demand for "clear air." From the forty level, a patrol ship that had caught the signal came corkscrewing down the red shaft to stand by for emergency work.... Chet called her commander from the cabin of Diane's ship. A word of