Quite motionless he stood, clutching the cold barrel of the Winchester in a spasmodic grip and staring up at those two watch-towers, built like gigantic swallows' nests into sheer rock wall. He could see the warriors stationed there, peering curiously down at him from the depths of heavy, bronze helmets--helmets which in shape much resembled those of an ancient Grecian hoplite, for the nose guards and cheek pieces descended so low as to completely mask the features of those strange guards. For crests these helmets bore exquisitely wrought bronze dolphins, with brilliant blue eyes of sapphire. But what fascinated Nelson most was the curious armor they wore. Beneath breast plates of polished bronze, these strange warriors wore what seemed to be a kind of chain mail--yet it was not that, for the texture had more the appearance of some heavy but pliant leather, finished with a metallic surfacing.

Suddenly the spell of mutual amazement was broken, for a tall warrior in a breast plate that glittered with diamonds and seemed altogether more ornate than the rest, clapped a short bra.s.s horn to his lips and blew a single piercing note. At once there appeared on the tunnel's floor, not a hundred yards from the startled aviator, a rank of perhaps twenty soldiers, accoutred exactly like those he beheld by the light boxes. They came scrambling over the boulders, their shadows grotesquely preceding them. In their hands were long shafted spears, and on their left arms rectangular shields, charged with a lively dolphin in the act of swimming. Some of them, however, held short hoses in their hands, hoses that sprouted from tight bra.s.s coils strapped to their broad shoulders.

Again the commanding figure aloft raised the horn. From the tail of his eye Nelson caught the gleam of metal in the orange glare. While a blast, harsh as the scream of a fire siren, echoed and re-echoed eerily through the pa.s.sage, there appeared a fresh detachment. Nelson shrank back in horror, for these bronze-armored warriors led, at the end of a powerful chain, two more of those huge, ferocious allosaurs, exactly like the one he had slain but a short while back.

Like well regulated automatons the hoplite rank opened to permit the pa.s.sage of those repulsive, eager monsters, then closed up again and halted, spears levelled before them in the precise manner of an ancient Grecian phalanx, while the men with those curious hose-like contrivances ran out to guard the flanks.

"I'm done for now," thought Nelson as he threw off the Winchester's safety catch. "I suppose they'll turn those nightmares loose on me."

He was right. For all the world as though they led war dogs, the keepers in brazen armor advanced, the dull metallic clank of their accoutrement clearly discernible above the sibilant hiss of their hideous charges, which hopped along grotesquely like kangaroos, using their long and powerful tails as a counterpoise.

Then the officer watching from the left hand swallow's nest shouted a hoa.r.s.e, unintelligible command, whereupon one of the keepers raised his right hand in a sharp gesture that instantly flattened the incredible monster to earth, exactly like an obedient bird dog.

As in a fantastic dream Nelson watched one of the armored guardians unsnap the hook of the powerful chain by which his allosaurus was secured. Then, whistling sharply, he clapped his hands and pointed straight at the motionless aviator. The creature's green white eyes flickered back and forth, and a chill, colder than the outer Arctic, invaded Nelson's breast as those unearthly eyes came to rest upon him.

Meanwhile the other allosaurus remained crouched, whining impatiently for its keepers to cast it loose.

Fixing burning eyes upon the American, the foremost keeper threw back his head. "Ahre-e-e!" he shouted. Instantly the freed allosaurus arose, balanced its enormous bulk, then commenced to leap forward at tremendous speed, clearing fifteen or twenty feet with each jump and uttering a curious, whistling scream as it bore down, a terrifying vision of gleaming teeth and talons.

Shaking off the paralysis of despair, Nelson whipped up the Winchester and, as before, sighted squarely between those blazing, gemlike eyes.

When the huge monster was but twenty feet away he fired, and the report thundered and banged in the cavern like the crash of a summer storm. In mid-air the ghastly carnivore teemed to stagger. Its tail twitched sharply as in an effort to recover its balance. Then, quite like any normal creature that is shot through the head, it lost all sense of direction and made great convulsive leaps, around and around, clawing madly at the air, b.u.mping into the rock walls and uttering soul-shaking shrieks of agony. Like a gargoyle gone mad it reeled back towards the startled rank of spearmen. As it came, Nelson saw the second allosaurus rear itself backwards and, balanced on its tail, strike out with powerful hind legs as its maddened fellow drew near.

Like razors the great talons ripped through the dying allosaurus'

belly, exposing the gray-red intestines as the stricken creature raced by, snapping crazily at the empty air.

A single mighty sweep of the monster's tail crushed five or six of the panic-stricken keepers and guards, strewing them like broken and abandoned marionettes among the stones. Hissing and obviously terrified, the second dinosaur watched the dying struggles of its mate; then, obedient to a terrified shout from its keepers, wheeled about to join in a frantic rout of the spearmen, who, casting aside shield, spear and bra.s.s coil, fled for dear life in the direction of those invisible pa.s.sages through which they had appeared.

CHAPTER II

No less amazed and alarmed than those vanished soldiers, Nelson remained rooted to the ground, conscious that in the swallow's nest overhead there remained only the officer--a tall, broad shouldered man with golden beard showing from under the cheek pieces of his helmet.

Across the body of the still writhing monster their glances met.

Nelson could see by the light of those strange pillars of fire that the other's eyes were blue as any Norseman's. Leaning far out over the stone parapet the other stared down upon the aviator from the depths of his jewelled helmet in a strange mixture of curiosity and awe.

Suddenly Nelson's nerves snapped and he shook a trembling fist at the martial figure above.

"Go away!" he shrieked, and reeled back on the edge of collapse. "Go away, you d.a.m.n phantom! You're driving me crazy--crazy, I tell you!"

The other stiffened, then turned and, uttering a hoa.r.s.e shout, vanished, leaving the noiseless and apparently heatless pillar of fire flaring steadily.

Recovering somewhat, Nelson set his teeth, advanced to the nearest corpse, stooped and regarded him who lay there, with bronze helmet fallen off.

"It's a man and not a ghost," he murmured as his finger encountered flesh that was still warm. "Red headed too, or I'm a liar. Now what in h.e.l.l is all this?"

For all his bewilderment he began to feel better and his swaying reason became steadier. "Bronze, bronze--nothing but bronze," the aviator told himself as he further examined the scattered equipment.

"Evidently these fellows don't know the use of iron or steel."

With increased curiosity he bent over another splendidly built dead man who lay with back broken and sightless eyes staring fixedly onto the steam current meandering silently along the cavern's roof. From the fallen man's belt were slung half a dozen curious weapons that looked not unlike potato mashers, except that they were bronze headed and had wooden handles.

"Hum," he commented, "kind of like the grenades the Boche used in the late lamented. Wonder what the devil these are?"

Suddenly his ear detected the sound of a footstep and, on looking swiftly up, he beheld that same yellow bearded officer who had directed the attack. This strange being had taken off his ponderous helmet to carry it in his left hand, while his right was held vertically in the immemorial sign of peace. On he came with powerful martial strides, a brilliant green cloak flapping gently behind him and the jewels in his brazen armor glinting like so many tiny colored eyes. The stranger was indeed handsome, Nelson noticed--and then he received perhaps the greatest shock of the whole chimerical adventure.

The gold bearded man halted some twenty feet away, smiled and spoke in a curiously inflected but perfectly recognizable voice.

"Welcome to the Empire of the Atlans. Prithee, Wanderer, what be thy name?"

For a long moment Nelson was entirely too taken back to make a reply.

Desperately his already perplexed brain tried to comprehend. Here was a handsome six-footer, dressed in the arms of an ancient race, speaking English of the seventeenth century!

As at a phantom, he regarded the stalwart, faintly ominous figure, from heavy leather sandals to bronze greaves, thence to wide belt from which dangled more of those curious grenadelike objects. His glance paused on the officer's beautifully wrought bronze cuira.s.se or breast plate which showed in relief an emerald scaled dolphin and trident.

These, Nelson decided, must be the national emblems of this incomprehensible nation.

Then their eyes met, held each other a long moment until the tall officer's features, disfigured by a long red scar across the jaw, broke into a hard smile.

"Hero Giles Hudson begs thy pardon," he said, "but methought thou spoke in the language of Sir Henry Hudson, my ancestor?"

"Sir Henry Hudson!" stammered Nelson incredulously. "The old explorer whose men turned him adrift? So that's why you're talking embalmed English!" In desperation his weary brain strove to understand.

"I know naught," replied the other with a grave smile, "save that the founder of our royal line spoke what he called English. He came from the Ice World to rule wisely over Atlans. He was the greatest Atlantean of history."

"Atlantean?" echoed Nelson, while his mind groped frantically in the recess of his memory. "Atlans, Atlantis!" A great light broke upon him. "The lost Atlantis! Great G.o.d!" Had he stumbled upon a remnant of that powerful people whose fabled empire had been drowned ten centuries ago in the cold waves of the Atlantic?

"Aye," the yellow haired warrior continued as though reading his thoughts, "long centuries ago this valley was peopled by those who escaped the great cataclysm which ended the mother country. Later came another race, barbarian wanderers like thyself." He bowed for all the world like a courtly English gentleman. "But methinks thou art in need of food and sustenance?"

"You bet I'm hungry," was Nelson's emphatic reply. "I'm one short jump of starvation and the D. T.'s. But hold on a minute," he cried. "I'm looking for a friend of mine. He went by here, didn't he?"

"Aye." A crafty expression Nelson did not like crept into Hero Giles Hudson's face as he solemnly inclined his head.

"For the nonce, fair sir, thy companion is hale and sound. I beg your patience."

With a quick gesture the Atlantean raised his dolphin-shaped horn and blew three short blasts while Nelson, in sudden alarm, c.o.c.ked his rifle and brought it in line with the other's chest. The glittering officer saw the motion, but made no effort to move from the line of sights.

"Thy gesture avails naught," said he with stiff courtesy. "When Hero Giles gives his word, it stands good though Heliopolis and the Empire of the Atlans fall."

One by one half a dozen spearmen appeared, all obviously very frightened and only moved by an apparently Spartan discipline.

Promptly they saluted, whereupon the Hero--as his t.i.tle appeared to be--uttered a number of brief commands in some guttural language entirely unintelligible to the dazed aviator.