Instantly the Atlantean prince strode forward, a commanding figure.

Momentarily his helmet and the dangling grenadelike bombs were sharply outlined against that unearthly yellow light. He raised his hand and dropped it, palm outward, to his chin in what must have been a salute.

The hissing sound of steam then faded into silence.

Followed at a respectful distance by a pair of silent, bronze-helmeted hoplites, Nelson and his guide descended a narrow stair, which broadened at the base. It was a very long staircase composed of perhaps two or three hundred steps which were occasionally interrupted by wide stone terraces. On these level s.p.a.ces were fixed what appeared to be enormous field guns of glittering bra.s.s. They were similar, yet somehow oddly dissimilar, to the great guns Nelson had seen in France.

"Behold, oh Wanderer," Hero Giles declaimed impressively, "the lands of Atlans and Jarmuth!"

It was a weird landscape that met Nelson's half-unbelieving gaze, a landscape green with that brilliance peculiar to spring meadows, lying beneath the same deep blue sky that overarched the surrounding barren ice fields which hemmed in this astounding valley.

A slight smile played over Hero Giles' thin lips as he watched the amazed aviator.

"The splendor of our country must indeed astound thee," he observed, "having come from the dreary fastness of the outer Ice World. But come; we are now to pa.s.s the great retortii guarding the entrance into the valley."

Nelson's eyes turned again to the weapons that so oddly resembled field guns. He examined them closely, inspecting them narrowly for the differences he knew must exist between them and the artillery that had thundered during the War of the Nations.

The chief difference lay in the mounting of these starkly beautiful weapons. They seemed to be fixed on a movable pivot set into the coal black rock itself. Like modern artillery, these curious pieces of ordnance bore a bronze shield to protect their crews, through which projected the long and very narrow barrels of the guns. Grouped like cannoneers about their piece stood various red-crested Atlantean artillerymen. At a glance Nelson recognized the difference in their equipment from that of the spearmen behind them. These former bore no shields, no swords or bombs, but wore that same kind of leather body-armor which graced the powerful limbs of Hero Giles. Their helmets, too, were different: only the dolphin crest with a tuft of red feathers spouting from it bore any resemblance to those of the infantry, and, moreover, the artillerymen's eyes were shielded by goggles with thick blue lenses.

As the Hero approached, officers among them saluted, then sank on one knee with head humbly bent.

"Rather odd looking guns," commented Nelson. "I'm not much of an artilleryman, but I'm wondering how you take up the recoil?"

The Atlantean's laugh, which always reminded his guest of the purr of a tiger, rang out. "Why, marry, good sir, there is no recoil! These guns do not use that powder which Sir Henry, founder of our line, did speak of. Thou wouldst see one fired?"

His curiosity immeasurably piqued, Nelson nodded, whereupon the Atlantean wheeled about and barked a brief command. With truly Prussian precision, the artillerymen sprang to their posts, some to a series of levers which sprouted from the rock platform without any apparent connection, and some to wheels and gauges of varying size that cl.u.s.tered in bewildering intricacy about the breech of the great bra.s.s gun.

"Markest thou that tree yonder, on the ledge of the valley?" The Atlantean's blunt outstretched finger indicated a towering pine sprouting from among a ma.s.s of reddish volcanic rock at the rim of that new world.

"Yes, I see it, but--" Nelson was astounded. A pine tree in the upper Arctic! That alone was sufficient cause for amazement. From a stiff red-plumed gun captain issued a brief series of commands which set the wonderfully drilled crew to silently adjusting their training and elevating mechanism. Click! Clack! Sis-s-s-s!

All up and down the vast staircase other gun crews stood watching.

Nelson saw their weird, bluish goggles raised to that platform where, for all the world like a coast defense howitzer, the great cannon swung majestically about on the ponderous, brazen column which seemed to support it. Gradually the muzzle was elevated, then traversed a few feet, to finally come to a halt.

"Jakul, a Hero!" shouted the gun captain, his hand raised to Hero Giles.

"Thou art ready, Friend Nelson?" he inquired in tolerant amus.e.m.e.nt.

"Mark well yon pine tree!

"Storr!"

Nelson saw one of the armored cannoneers bend forward, firmly grasp a short lever with both hands. In antic.i.p.ation of a terrific report, the aviator pressed finger tips to his ears. There followed not a thundering crash, but a curious, eery, high-pitched scream, rather like that of a fire siren. There was no smoke! Nelson's incredulous eyes sought the muzzle of the gun and detected issuing from it what appeared to be a thin, white rod. This shimmering stream of silver shot straight towards the pine tree, gradually widening and giving off feathery billows of steam. In a fraction of a moment the target was completely veiled from sight in a furious pall of clouds which, to Nelson's great astonishment, did not dissipate nor condense with the speed of ordinary steam.

"Nava!"

With impressive suddenness the screaming sound faded, leaving a sort of stunned silence on the gun platform. The gunners stalked back to their original stations.

Slowly, reluctantly, the mist enveloping the pine tree cleared away and Nelson felt a chill creeping up his spine. The pine was a good three hundred yards away, yet now it sagged limp to earth, stripped of bark, twigs and needles, only the bright yellow trunk and major branches remaining.

"That tree was a good two feet thick," mused the astounded aviator, "yet the steam gun bent it like a sapling. My G.o.d! What would it do to a man?"

"What thinkest thou of our retortii?" The Atlantean's beard glinted like metal as he shook with a grim, silent laughter. "These great retortii can shoot half a league and will blast any living thing in their path. I tell thee, friend Nelson, the discharge of even a small retortii will strip the flesh from a man's bones as a peasant strips the husk from an ear of corn!"

"Fearful, terrible!" was Nelson's awed comment. "Is there no defence against them?"

"Of course." The Hero's green feather-crested helmet gleamed with a nod. "Was there ever an instrument of war that had not its defence?

Yea, we have the blue vapor to shatter steam particles--it is called the blue maxima. Thou wilt presently see some of our troops armed with it."

"But where does this steam come from? How is it generated?" These two were the first of a host of questions which trembled on Nelson's lips.

"The steam," replied the Atlantean, "comes from the earth. We compress it many times, then feed it into our retortii. Without the heat of Mother Earth and our flame suns we would all perish. Steam is our motive power, our defence and our enemy!"

He flung his hand towards the vast valley stretched before them. It was hemmed in on either side by colossal breath-taking mountain ranges, whose caps shone and glittered with an eternal snow.

"Some foothills! They must rise all of 25,000 feet from the valley floor," decided the aviator, "and I should imagine this valley is a good mile below sea level. Yes! That must be it: this nightmare country lies in a huge geographical fault--something like the Dead Sea."

Mile after mile he could see fertile green land stretching away toward some low undulating hills on the horizon. Atlans was very thickly settled--that he recognized at once--for the terrain was divided and sub-divided into a vast checker-board, such as he had seen in France and Germany, while terraces, green with produce, had been laboriously gouged out of the frowning mountain sides.

Then his eye encountered the source of that curious amber light which pervaded the whole valley. A t.i.tanic flaming gas vent spouted like a cyclopean torch from the peak of a nearby mountain. Its steady, subdued roar struck Nelson's ear as he turned away his eyes, for the glare was too intense to be long endured. Further down the valley were two more such incandescent vents, shooting their flaming tongues boldly into the sky, warming the air and casting that rich, amber radiance over all.

"That is Mount Ossa nearest us," the Atlantean's voice came as though from a long distance. Victor Nelson was too staggered, too unspeakably amazed to register the fact of the Hero's proximity. "Below are Pelion and Jilboa, which, with Jabor, the greatest of all the flames, illuminate and warm the valley."

Nelson's eye, trained to be all observant, ranged far and wide, noting the presence of many lacy, frothing geysers which spouted at varying intervals. There were, also, many steaming ponds and waterfalls which sprang in smoky confusion from the rock palisades to either side.

Nearer at hand he could distinguish a number of huge stone structures, evidently forts and public buildings. Strategically placed all about were more of those terrible bra.s.s retortii, gleaming dully under the incandescent glare of the flame sun.

"Come," cried Hero Giles with an impatient gesture of his hand, "we must e'en hasten to the tube-road terminal. Word has long since been sent to Heliopolis of thy arrival."

Downwards into the valley, which grew ever warmer and more fertile, the Atlantean led on, explaining a thousand and one details to the astounded aviator. Presently they approached the nearest of the great stone structures and Nelson received yet another shock. In a courtyard was drilling what would correspond to a troop of cavalry in the outer world. In orderly ranks the troopers wheeled, marched and counter-marched, their brazen armor twinkling and clashing softly as they carried out their evolutions with an amazing precision. But what astonished Nelson was the fact that each of these strange troopers bestrode a lithe, long-limbed variety of dinosaur, a good half smaller than the allosauri he had encountered in the tunnel. These agile creatures ran about on their hind legs with astonishing speed, using a long reptilian tail as a balance.

On the back of each trooper was fastened a compact circular copper tank, from which sprouted a flexible metal hose that ended in what looked like a ponderous type of pistol.

In distinction to the red of the artillerymen and the blue of the Hoplites, these curious cavalrymen wore brilliant crests of yellow feathers, and from their lance tips fluttered tiny pennons of that same color.

"They must travel at least as fast as a race horse," decided the aviator after studying the swift evolutions of the scaly chargers. To his ears came the curious dry sc.r.a.pe and rattle of their h.o.r.n.y claws on the stone pavement of the drill yard.

He would have lingered to see more, for those grotesque, lizard-like chargers interested him immensely, but Hero Giles beckoned imperiously. So, dropping the Winchester to the hollow of his arm, Nelson followed him into the brilliantly gas-lit depths of the great structure.