It was upward they leaped, with all the force of their earthly muscles, toward the big window-opening a half-dozen feet in the wall above them. Like released steel springs they sat up, and Randall heard the thump of their feet as they struck the opening's sill, heard wild cries suddenly coming from beneath them, as the guards turned back toward them. Crimson rays clove up like light toward them, but the instant's surprise had been enough, and in it they had leaped on and through the opening, into the outside night!

As they shot downward and struck the metal paving outside, Randall heard a wild babble of cries from inside. A moment he and Lanier gazed frenziedly around them, then were running with great leaps along the base of the building from which they had just escaped.

In the darkness of night the Martian city stretched away to their right, its ma.s.sive dark cone-structures outlined by points of glowing ruddy light here and there upon them. Beside the city's metal streets were illuminated by the brilliant field of stars overhead and by the soft light of the two moons, one much larger than the other, that moved among those stars.

Along the street crocodilian Martians were coming and going still, though in small numbers, there being but few in sight in the dim-lit street's length. Lanier pointed ahead as they leaped onward.

"Straight onward, Randall!" he jerked. "There seem fewer of the Martians this way!"

"But the great cone of the matter-station is the other way!" Randall exclaimed.

"We can't risk making for it now!" cried the other. "We've got to keep clear of them until the alarm is over. Hear them now?"

For even as they leaped forward a rising clamor of hissing cries and rush of feet was coming from behind as scores of Martians poured out into the darkness from the great cone-building. The two fugitives had pa.s.sed by then from the shadow of the mighty structure, and as they ran along the broad metal street toward the shadow of the next cone, through the light of the moons above, they heard higher cries and then glimpsed narrow shafts of crimson force cleaving the night around them.

Randall, as the deadly rays drove past him, heard the low detonating sound made by their destruction of the air in their path, and the inrush of new air. But in the misty and uncertain moonlight the rays could not be loosed accurately, and before they could be swept sidewise to annihilate the two fleeing men they had gained, with a last great leap, the shadow of the next building.

On they ran, the clatter of the Martian pursuit growing more noisy behind them. Randall heard Lanier gasping with each great leap, and felt himself at every breath a knife of pain stabbing through his lungs, the rarified atmosphere of the red planet taking its toll.

Again from the darkness behind them the crimson rays clove, but this time were wide of their mark.

With every moment the clamor of pursuit seemed growing louder, the alarm spreading out over the Martian city and arousing it. As they raced past cone after cone, Randall knew even the increased power of their muscles could not long aid them against the exhaustion which the thin air was imposing on them. His thoughts spun for a moment to Milton, in the laboratory behind, and then back to their own desperate plight.

Abruptly shapes loomed in the misty light before them! A group of three great Martians, reptilian shapes that had been coming toward them and had stopped for an instant in amazement at sight of the running pair. There was no time to halt themselves, to evade the three, and with a mutual instinct Lanier and Randall seized together the last expedient open to them. They ran straight forward toward the astounded three, and when a half-score feet from them, leaped with all their force upward and toward them, their tensed bodies flying through the air with feet outstretched before them.

Then they had struck the group of three with feet-foremost, and with the impetus of that great leap had knocked them sprawling to this side and that, while with a supreme effort the two kept their balance and leaped on. The cries of the three added to the din behind them as they threw themselves forward.

They flung themselves past a last cone building to halt for an instant in utter amazement despite the nearing pursuit. Before them were no more streets and structures, but a huge smooth-flowing waterway! It gleamed in the moonlight and lay at right angles across their path, seeming to flow along the Martian city's edge.

"A ca.n.a.l!" cried Lanier. "It's one of the ca.n.a.ls that meet at this city and flow around it! We're trapped--we've reached the city's edge!"

"Not yet!" Randall gasped. "Look!"

As he pointed to the left Lanier shot a glance there; and then both of them were running in that direction, along the smooth metal paving that bordered the mighty ca.n.a.l. They came to what Randall had seen, a mighty metal arch that soared out over the waterway to its opposite side. A bridge!

They were on it, were racing up the smooth incline of it. Randall glanced back as they reached the arch's summit. From that height the city stretched far away behind them, a lace of crimson lights in the night. He glimpsed the gleam of the giant waterway that encircled the city completely, one that was fed by other ca.n.a.ls from far away that emptied into it, the great city's vital water-supply brought thus from this world's melting polar snows.

There were moving lights behind now, too, pouring out onto the metal paving by the waterway, moving to and fro as though in confusion, with a babel of hissing cries. It was not until Randall and Lanier were running down the descending incline of the great arched bridge, though, that the lights and shouts of their pursuers began to move up on that bridge after them.

Running off the bridge's smooth way, the two found themselves stumbling on through the darkness over more metal paving, and then over soft ground. There were no lights or buildings or sounds of any sort on this farther side of the great waterway. A tall dark wall seemed suddenly to loom up out of the darkness some distance ahead of the two.

"The crimson jungle!" Randall cried. "The jungles we glimpsed from the city! It's a chance to hide!"

They raced toward the protecting blackness of that wall of vegetation.

They reached it, flung themselves inside, just as the pursuing Martians, a ma.s.s of running crocodilian shapes and of great racing centipede-machines, swept up over the bridge's arch behind. A moment the two halted in the thick vegetation's shelter, gasping for breath, then were moving forward through the jungle's denser darkness.

Thick about them and far above them towered the ma.s.ses of strange trees and plant life through which they made their way. Randall could see but dimly the nature of these plant-forms, but could make out that they were grotesque and unearthly in appearance, all leafless, and with ma.s.ses of thin tendrils branching from them instead of leaves. He realized that it was only beside the arid planet's great ca.n.a.ls that this profusion of plant life had sufficient moisture for existence, and that it was the broad bands of jungle bordering the ca.n.a.ls that had made the latter visible to earth's astronomers.

Lanier and he halted for a moment to listen. The thick jungle about them seemed quite silent. But from behind there came through it a vague tumult of hissing calls; and then, as they glimpsed red flashes far behind, they heard the crashing of great ma.s.ses of the leafless trees.

"The rays!" whispered Lanier. "They're beating through the jungle with them and the centipede-machines after us!"

They paused no more, but pushed on through the thick growths with renewed urgency. Now and then, as they pa.s.sed through small clearings, Randall glimpsed overhead the fast-moving nearer moon and slower sailing farther moon of Mars, moving across the steady stars. In some of these clearings they saw, too, strange great openings burrowed in the ground as though by some strange animal.

The crashing clamor of the Martians beating the jungle behind was coming close, ever closer, and as they came to still another misty-lit clearing, Lanier paused, with face white and tense.

"They're closing in on us!" he said. "They're hunting us down by beating the jungle with those centipede-machines, and even if we escape them we're getting farther from the city and the matter-station each moment!"

Randall's eyes roved desperately around the clearing; and then, as they fell on a group of the great burrowed openings that seemed present everywhere about them, he uttered an exclamation.

"These holes! We can hide in one until they've pa.s.sed over us, and then steal back to the city!"

Lanier's eyes lit. "It's a chance!"

They sprang toward the openings. They were each of some four feet diameter, extending indefinitely downward as though the mouths of tunnels. In a moment Randall was lowering himself into one, Lanier after him. The tunnel in which they were, they found, curved to one side a few feet below the surface. They crawled down this curve until they were out of sight of the opening above. They crouched silent, then, listening.

There came down to them the dull, distant clamor of the centipede-machines crashing through the jungle, cutting a way with rays, their clamor growing ever louder. Then Randall, who was lowest in the tunnel, turned suddenly as there came to him a strange rustling sound from _beneath_ him. It was as though some crawling or creeping thing was moving in the tunnel below them!

He grasped the arm of Lanier, beside and a little above him, to warn him, but the words he was about to whisper never were uttered. For at this moment a big shapeless living thing seemed to flash up toward them through the darkness from beneath, cold ropelike tentacles gripped both tightly; and then in an instant they were being dragged irresistibly down into the lightless tunnel's depths!

As they were pulled swiftly downward into the tunnel by the tentacles that grasped them an involuntary cry of horror came from Randall and Lanier alike. They twisted frantically in the cold grip that held them, but found it of the quality of steel. And as Randall twisted in it to strike frantically down through the darkness at whatever thing of horror held them, his clenched fist met but the cold smooth skin of some big, soft-bodied creature!

Down--down--remorselessly they were being drawn farther into the black depths of the tunnel by the great thing crawling down below them.

Again and again the two twisted and struck, but could not shake its hold. In sheer exhaustion they ceased to struggle, dragged helplessly farther down.

Was it minutes or hours, Randall wondered afterward, of that horrible progress downward, that pa.s.sed before they glimpsed light beneath? A feeble glow, hardly discernible, it was, and as they went lower still he saw that it was caused by the tunnel pa.s.sing through a strata of radio-active rock that gave off the faint light. In that light they glimpsed for the first time the horror dragging them downward.

It was a huge worm creature! A thing like a giant angleworm, three feet or more in thickness and thrice that in length, its great body soft and cold and worm-like. From the end nearest them projected two long tentacles with which it had gripped the two men and was dragging them down the tunnel after it! Randall glimpsed a mouth-aperture in the tentacled end of the worm body also, and two scarlike marks above it, placed like eyes, although eyes the monstrous thing had not.

But a moment they glimpsed it and then were in darkness again as the tunnel pa.s.sed through the radio-active strata and lower. The horror of that moment's glimpse, though, made them strike out in blind repulsion, but relentlessly the creature dragged them after it.

"G.o.d!" It was Lanier's panting cry as they were dragged on. "This worm monster--we're hundreds of feet below the surface!"

Randall sought to reply, but his voice choked. The air about them was close and damp, with an overpowering earthy smell. He felt consciousness leaving him.