The mechanism of the radio telescope whirred into life as he spoke and its disk shone bright with the reflected light of Titan as it pictured the body. The Nomad was speeding toward the ill-omened satellite at the rate of more than a thousand miles a second.

But the surface was nowhere visible and Mado adjusted the focus so that the view of the billowy cloud-covering fell rapidly away. Though actually they were approaching the satellite with tremendous velocity, it receded swiftly in the rulden\'s disk until the entire body showed as a perfect sphere of uniform brilliancy. All surface markings were concealed by the blanket of clouds.

"Just a moment, Mado," said Detis. "I believe I saw something."

The Martian pressed a button and the image was stationary. A tiny black spot had appeared near one edge of the satellite\'s disk and this now spread rapidly like a blot of spilled ink. Then it stretched out into a wriggling line that quickly streaked its way across the equator, completely banding the body as they watched. A moment it lay there like a great serpent encircling the globe, and then it vanished in a flash of intense light that left them blinking in amazement. It was as if a trail of gunpowder had been laid across the surface and then set off by a torch in the hand of some unseen giant of the cosmos. A strange electrical storm that agitated the cloud blanket mightily, then left it more densely closed in than before.

Through the forward port the satellite could be seen with the naked eye, growing larger now and resolving itself into a tiny globe. To Carr it seemed that the diminutive moon winked provocatively as he turned to regard it without the rulden\'s aid. Off to the west, Saturn and her rings almost filled the sky, and their baleful light shone cold and menacing against the black velvet of the heavens.

Mado took the controls when the Nomad entered the atmosphere of Titan and drifted over the sea of clouds. He corrected the altimeter for the mass of this body of three thousand miles diameter, and noted that they were up about six thousand feet. Test samples indicated that the outside air, although thin, was pure. But they did not open the ports as they had no intention of landing.

Ora had not yet awakened and Carr hoped fervently that she would not do so until they had left the immediate vicinity of Titan. It was vastly better if she missed seeing anything of the barbarians of the cloudy satellite. Besides, with her adventuresome and fearless nature, she\'d not be satisfied merely to look on from afar—she\'d want them to land. And that must not be done.

Something tinkled metallically against the hull plates of the vessel. Again and again the sound was repeated, and soon they saw that the air was filled with driving particles which clattered on the thick glass of the ports and contacted resoundingly with the hull. A vast cloud of black loomed directly ahead, springing up from the tossing cloud banks; and Mado yanked at the controls, swerving the Nomad sharply from her course.

But there was no escaping the fury of that sudden squall; they were in the thick of it in an instant, and the ship was buffeted and tossed about as if it were a toy. Millions of the driving particles battered the Nomad and the din of their pounding was terrific as the ship was whirled deeper into the midst of the tempest.

Carr saw that the black particles were piling up around the rim of the port, sticking fast to the metal of the hull. They were bristling in fantastic array, like iron filings adhering to the poles of a magnet. In a flash it came to him that these particles were magnetic; the Nomad was covered with them and they piled on ever more thickly, soon weighting her down so heavily that she lost altitude. They were at the mercy of a furious electrical storm of mysterious nature.

"Imps of the canals!" Mado shouted above the din. "We\'re finished! The machinery is paralyzed. This iron hail is charged."

The viewing port was completely covered over now with particles that arched across from rim to rim, slender rod-like things about two inches long and of the thickness of heavy wire. Black, they were, as black as graphite. Detis worked frantically with Mado at the useless controls, vainly endeavoring to stabilize the pitching vessel.

Dazed by the suddenness of the calamity, Carr turned to look at the altimeter. Five thousand feet, forty-five hundred, four thousand! Nose down, and reeling drunkenly, the Nomad was diving to certain disaster on the rocky ground of Titan. He dashed from the control room, calling distractedly to Ora as he raced along the passageway.

She staggered from the stateroom and into his arms, a slim, boyish figure in her snug leather jacket and breeches. Together they were flung violently against the partition by a heavy lurch of the vessel.

"What is it?" she gasped, clinging to him for support.

"A freak storm, in Titan\'s atmosphere. Guess the Nomad\'s done for." Carr drew her fiercely close as an awful picture flashed across his mind—of Ora\'s body mangled in twisted wreckage; of the savages finding it, down there....

The metal floor-plates seemed to buckle and hurl themselves aft with a grinding crash of disrupted joints. Holding desperately to the precious little body within his arms, Carr was thrown off his feet. There was a detonation as if the universe had been blasted into oblivion—then darkness, and numbed silence.

"Carr, you\'re hurt!" Ora moaned.

He was—a little. His head was splitting and the taste of blood was in his mouth, but it was nothing serious. He\'d been half knocked out, but his head was clearing already. Of far greater importance was the fact that Ora was unharmed; he satisfied himself of that immediately.

"I\'m all right," he grunted, struggling to his feet and feeling around in the blackness.

The lights in the passage were out and he groped blindly along the partition, the metal of which had suddenly become very hot to the touch. There was a curious feeling of lightness as if his body had no weight at all; the ship rolled gently and he knew they were falling swiftly to the inevitable crash. Yet he clung fast to Ora, and, together, they made their way to the control room.

Faint daylight streamed in through the ports there ............