In rapid succession two more victims were slaughtered amid the blood-hungry cheers of the Jarmuthian populace. Now the great bowl hissed and bubbled with a generous supply of the dark red fluid, from which rose clouds of evil-smelling steam that fanned the hideous features above.

From below suddenly arose an excited shout far mightier than any which had preceded it, when the executioners, sweating from their exertions, now turned and, spying Nelson, hurried forward. Coincidently, the American's bound hands disappeared beneath the chiton. Squaring his shoulders, he gripped the pistol, prepared to make a good end.

"They'll get me, but before I die I'll send at least two or three of these devils to h.e.l.l," he thought. "Come on--"

But, for an inexplicable reason, the arch-priest beckoned back his satellites, while roar upon roar of terrific excitement swelled from the swarming mob below, and a shout which at last became distinguishable bid fair to split the heavens. "Altara! Altara!

Altara!"

Slowly, the temporarily reprieved victim's muscles stiffened. He understood. The next victim was to be the fair Altara, sister of Altorius and Sacred Virgin of Atlans.

"Altara! Altara!" A rising hurricane of impa.s.sioned human voices thundered the name.

Suddenly, the desire to live burned doubly strong in the American's breast. He must somehow prevent this inhuman catastrophe. But how?

How?

Stealing a quick glance over his shoulder, Nelson stifled a groan. The southern horizon remained clear, and put an end to hope. No help! He must fight it out to the end alone.

A rank of exultant, black-bearded priests now appeared at the head of the stairway, then a quartet of olive skinned, semi-naked priestesses joyfully clashing bra.s.s cymbals.

There came an interval--and Nelson's heart stood still as there appeared the lovely head and shoulders of her whom he had first seen in the heart of the revolving crystal. Even more fiercely, mad revolt at fate gripped him.

Through hot, strained eyes the American saw that the stately Altara was beautiful beyond all possible comparison, and that she seemed utterly unafraid in the hour of her dreadful death. The Atlantean maiden's large, clear blue eyes were fixed with calm resignation on the distant flame sun of Jilboa. On her curling golden hair had been set a circlet of ceremonial yellow roses, while her white, slender body was thinly covered with a scanty robe of yellow silk.

Slowly, and moving her small bare feet in a regal stride, Altara climbed the last few steps and stood straight and unafraid before the hideous demon G.o.d of Jarmuth.

Thousands of frantic inner voices a.s.sailed the aviator's consciousness. "Save her! You must save her! She's too young, too beautiful to die!"

Like a vast maelstrom of sound, so swelled the l.u.s.tful cry of the dark mult.i.tude at the base of the Ziggurat, while the arch-priest chanted his litany in a sort of triumphant exultation. Then, all at once, one of the executioners roughly tripped the golden haired girl, sprawling her helpless on the b.l.o.o.d.y stones; and, before Nelson could quite realize it, the slender, silver hued form lay limp and helpless between Beelzebub's b.l.o.o.d.y claws.

Like a dynamo furiously gathering speed, so buzzed Nelson's brain. He was going to save her--if only for a brief interval! One man against a nation. Through a raging mist of fury he saw the red-robed priest raise his lean arms; then the American's bound hands darted beneath the blue chiton to reappear immediately. No one saw the pistol, for every eye was rivetted upon the gleaming, sickle-knife of the red priest. Like a voice from h.e.l.l, that eery scream burst again from Beelzebub's throat as his priest stepped near, the knife raised.

Amid a deafening roar the sickle-knife flashed higher; but it never fell, for the red priest suddenly reeled, clutched his chest and, staring wildly, staggered sidewise, while the a.s.sembled priests stared thunderstruck. The deafening roar of Beelzebub, the clamor of horns and cymbals had drowned out the report. In superst.i.tious awe the Jarmuthians leaped back, panic-stricken, from the convulsively writhing body of the red priest, which rolled crazily down the steps before the idol; but a high shout of terror rang out as he toppled off the summit and, like a discarded puppet, plunged down the precipitous side of the cone-like tower.

Again Nelson's pistol spat, and two of the executioners collapsed in kicking agony. Like an avenging fury, the American raged about the summit, the pistol in his bound bands dealing death right and left until panic seized the remaining priests, who, with one accord, abandoned their weapons to rush headlong down the dizzy, winding roadway. In a trice, none but Altara, Nelson, the two Atlanteans and the fallen priests remained on the summit.

It was the work of a moment for the Atlanteans to cast loose Nelson's bound wrists, and he theirs; time was precious, for, from below, a furious cohort of spearmen were charging up the stairs, their dark features terrible in their wrath.

"Only four more shots!" The sickening realization dashed into Nelson's brain. "That'll never stop them." Then in the midst of his despair he saw an answer. Stepping back he fired twice full into the great steam coil circling the base of the idol.

_Spang! Spang!_ His bullets smacked through the copper coil to puncture neat, round holes. As he fervently hoped, jets of live steam rushed through these vents with terrible force and bathed the head of the stairs with a scalding, blinding vapor. Howling like mad beasts, the agonized Jarmuthian hoplites fell back, while overhead Beelzebub bellowed incessantly, shaking the sky with his hideous voice.

"That's better." But Nelson knew his triumph to be brief. "_Where in h.e.l.l is Alden?_" he raged as with shaking hands be released the bewildered girl from the death bar after the two Atlanteans had lifted it and its fair burden from the claws of Beelzebub.

Picking up the swords and other weapons of the fallen priests the two Atlanteans uttered their deep-toned war cry of _Halor van!_ and joyously prepared to die fighting, as furious roar on roar of wrath arose from the populace, infuriated at being cheated of their prey.

But the black-armored temple guards dared not charge those twin steam jets barring their approach. Accordingly they tried other means.

Nelson's heart stopped as a small, dark object sailed up from below and clattered on the platform. It was a grenade. With the speed of thought, the American kicked it to the landing below, where it exploded, annihilating a detachment of Jarmuthians by drenching them with the terrible fungus gas. Heart bounding with savage joy, Nelson watched the deadly green fog leap from the broken grenade and of its own accord settle on the nearest soldiers. With the usual astonishing speed there formed on the stricken soldiery that poisonous yellow mould, whose fungus-like shoots sprouted through nostrils and mouths.

On the dense crowd below the bomb's effect was appalling, and no more grenades were hurled....

During the respite Nelson's anguished eyes once more swept the skies.

He started. Was it true or was it a mirage? Far to the southward a small, black speck materialized in the orange-hued heavens. Good old Alden! Hope wavered in the American's breast. Could he and his two fellows beat off the infuriated Jarmuthians long enough? He doubted it.

A shower of spears sailed up, but because of the angle, their trajectory was too great, and like rays of death the lances flashed harmlessly overhead to plunge over the summit and wreak death among those on the other side.

Nearer and nearer came the black speck while from the populace a low shout of amazement arose. Coincidently Nelson's heart stopped; aghast, he saw that the steam was no longer hissing from the holes at the idol's feet! Evidently, the steam current had been shut off from below to allow the raging priests to lead their followers in a desperate charge up the stairs.

Marshalling an Atlantean to either side, Nelson sprang to the head of the stair and fired full in the face of gorgeously robed priests who staggered back screaming. But the others wavered only an instant.

"_Halor van!_" Both Atlanteans hurled spears retrieved from the abandoned weapons--and each struck down his man.

The American's eye flickered up. Yes, there came a strange, but welcome sight: a great creature with enormous, leathery pinions was circling down towards the tower top! A clashing of weapons brought Nelson's eyes earthwards. He joined in a furious melee at the stair top, like the Atlanteans, using a captured bronze sword. There came a deep groan as the right-hand Atlantean collapsed with a bloodied bronze spear point standing far out from between his naked shoulder blades.

A swooping shadow fell across the slowly advancing attackers.

Beholding that awesome creature the Jarmuthians cowered, hesitated; then in headlong panic they darted below, uttering howls of fear and pursued by the surviving Atlantean, who, gone berserk, must have shortly paid for his folly.

The pteranodon was now quite recognizable, and seated on a double saddle was Alden, skillfully guiding the ungainly monster by means of a curious bridle, by shifting his weight and by pressing certain nerve centers between the great reptile's leathery shoulders.

Down, down circled Alden until the great wings skimmed just above Beelzebub's ugly golden head.

Her courage strained beyond endurance, Altara screamed shrilly in fear as Alden guided the huge reptile to the summit and forced it to light.

"Quick!" shouted Alden. "They're coming back up!"

"All right!" Catching up the fainting girl, Nelson hurdled two or three fallen bodies, and, while Alden showered fungus bombs upon the returning Jarmuthians, he laid his precious burden across the saddle and secured her with straps specially designed for the purpose.

"All right, d.i.c.k," he snapped. "Get going!"

"But you?" Alden's brown face was terribly intent.

"I'm not going! This creature could never carry the three of us. It can't, I tell you! Hurry, those devils are coming!"

Alden folded his arms. "If you don't go, I don't."

"All right then," snarled Nelson, vaulting into the saddle after casting loose the inert, yellow-robed girl. "Be a d.a.m.ned fool! We'll all die now."