The Neanderthal Man had not learned to use the wheel; and these man-animals, too, used only the sheer strength of their corded muscles as they hauled at the body of a beast.

It dragged along the path behind them, rolling at times to show the white of its belly instead of the flexible armor-plating that protected its back. Fresh blood flowed from a wound in the white under-skin; this, and the dripping flints that tipped their spears, told how death had come. One curving horn that projected from a wrinkled snout caught at times in the undergrowth, and then the ones who dragged it would throw themselves upon the head with snarls of fury and twist the big horn free.

The rocky cliff was honeycombed with caves. A cry, half-human in its tone, brought an avalanche of figures scurrying forth. Children, whose distended abdomens told of the alternate feasting and hunger that was theirs, were cuffed aside by women who shouted shrilly at sight of the prize. Older men came, too, and in a screaming mob they threw themselves upon the carca.s.s of the beast that had been dragged into the open.

Flint knives came into play, then sharpened stakes that were thrust through the bleeding meat. Young and old seized what they could, leaped across the little stream that trickled downward through the valley, and raced for the nearest fires.

The fumaroles made places for roasting, and these half-men had learned the taste of cooked meats. Their jaws were slavering as they waited.

The scents were tantalizing.

A hunter was reaching to s.n.a.t.c.h a shred of half-cooked meat when a woman of the tribe gave a scream that was shrill with fear. She pointed her gnarled hand upward on the face of the cliff.

An opening was there, a black cave-mouth in the black cliff. Above their own caves, was this higher opening, yet they must have explored it often--must have followed it as far as they dared, where it led to the mountain's innermost depths. Yet from this familiar place there stepped forth an apparition. Another followed, and another--three strange creatures like none the savage eyes of this world had ever seen.

Clothing torn to rags--faces black and smeared with blood--hands that reached groping and trembling toward the light, until the half-blinded eyes of one saw the trickling brook.

Then, "Water!" he croaked in a voice hardly more human than the grunts of horror from below, and he took the hand of another to help in the steep descent--while the tribe beneath them forgot their antic.i.p.ated feast, forgot all but their primordial fear of the unknown, and, with startled cries, broke and ran for the safety of the forest....

CHAPTER IX

_The Throwers of Thunder_

It is doubtful if Walter Harkness heard or consciously saw that fleeing tribe. He saw only the glorious sunlight and its sparkling reflection upon the stream; and in his nostrils was the scent of roasting meat to rouse him to a frenzy.

For seven Earth days he and Chet had kept account of the hours. How long after that they had followed their stumbling course he could not have told. Time ceased to be measured in hours and days; rather was it reckoned in painful progress a foot at a time up rocky burrows, helping, both of them, to ease the path for the girl who struggled so bravely with them, until aching muscles refused to bear them further.

Then periods of drugged sleep with utter fatigue for an opiate--and on again in hopeless, aimless wandering.

And now, the sun! And he was plunging his head into icy water to drink until he strangled for breath! He knew that Chet and Diane were beside him. A weak laugh came to his lips as he sat erect: the girl had drunk as deeply as the rest--and now she was washing her hands and face.

The idea seemed tremendously amusing--or was it that the simple rite indicated more than he could bear to know? It meant that they were safe; they had escaped; and again a trifle like cleanliness was important in a woman's eyes. He rocked with meaningless laughter--until again a puff of wind brought distinctly the odor of cooking food.

A hundred feet away, up higher in the valley, were the first of the fires. Harkness came to his feet and ran--ran staggeringly, it is true, but he ran--and he tore at some hanging shreds of smoking meat regardless of the burn. But the fierce gnawing at his stomach did not force him to wolf the food. He carried it back, a double handful of half-cooked meat, to the others. And he doled it out sparingly to them and to himself.

The cold water had restored his sanity. "Easy," he advised them; "too much at first and we're done for."

He was chewing on the last shred when a thought struck him; he had been too stunned before to reason. For the first time he jerked up his head in startled alarm. He looked carefully about--at the meat on its pointed stakes, at the distant fires, at the open glade below them and the dense jungle beyond where nothing stirred.

"Cooked meat!" he exclaimed in a whisper. "Who did it? This means people!"

The memory that had registered only in some corner of a mind deeper than the conscious, came to the surface. "I remember," he said. "There were things that ran--men--apes--what were they?"

"Oh, Lord!" Chet groaned. "And all I ask is to be left alone!" But he wearily raised himself upright and verified the other's words.

"They ran toward that opening among those trees. And I'll bet they live in these caves up here behind us. I got a whiff of them as we came past: they smelled like a zoo."

They had come out on top of the lava-flow, close to its end. The molten rock had hardened to leave a drop of some forty feet to the open glade below. Beyond that the jungle began, but behind them was the lava bed, frozen in countless corrugations. Harkness rose and helped Diane to her feet: they must force their aching muscles to take up their task again.

He peered up the valley where a thousand fires smoked. "That stream,"

he said, "comes in from a little valley that branches off up there. We had better follow it--and we had better get going before that gang recovers from its surprise."

They were pa.s.sing the first of the fires where the meat was smoking when Chet called a halt. "Wait a bit," he begged: "let's take a sirloin steak along--" He was haggling at a chunk of meat with a broken flint when a spear whistled in and crashed upon the rocks.

Harkness saw the thrower. Beyond the lava's edge the jungle could be seen, and from among the spectral trees had darted a wild figure whose hairy arm had snapped the spear into the air.

There were more who followed. They were sliding down the slender trunks that supported the branches and leafy roof high above the ground. To Harkness the open doorway to the jungle seemed swarming with monkey-men. The movement of the three fugitives had been taken as a retreat, and the courage of the cave-dwellers had returned.

Harkness glanced quickly about to size up their situation. To go on was certain death; if these creatures came up to meet them on the lava-beds, the end was sure. The escarpment gave the three some slight advantage of a higher position.

One vain wish for the pistol now resting in the deep gra.s.s beside a vanished ship; then he sprang for the weapon that had been thrown--it was better than nothing--and advanced cautiously to the lava's edge.

No concealment there; no broken rocks, other than pieces of flint; a poor fortress, this, that they must defend! And the weapons of their civilization were denied them.

Another spear hummed its shrill song, coming dangerously close. He saw women-figures that came from the jungle with supplies of weapons.

Short spears, about six feet long, like the one he held. But they had others, too--long lances of slender wood with tips of flint. Thrusting spears! He had a sickening vision of those jagged stone heads ripping into their bodies while these beasts stood off in safety. It was thus that they killed their prey. And Diane--he could not even spare her--could not give her the kind oblivion of a mercy-shot!

The other two were lying beside him now at the edge of the sloping cliff. The bank of shining gray was not steep; the enemy would climb it with ease. Hopeless! They had won through for this!... Harkness groaned silently in an agony of spirit at thought of the girl.

"Oh, for one detonite sh.e.l.l to land among them!" he said between clenched teeth--then was breathless with a thought that exploded within his mind.

His fingers were clumsy with haste as he fumbled at the head of the spear. The sharp-edged stone was bound to its shaft with sinew, wound round and round. The enemy were out in the open; he spared an instant's look to see them advancing. A clattering of falling spears sounded beyond, but the weapons were overcast, thanks to the protection of the rocky edge.

"A sh.e.l.l!" Harkness spoke with sharp intensity. "Give me a cartridge from your belt, quick!"

Chet handed him one. Harkness took one look, then pulled a cartridge from his own belt.

"That explains it," he was muttering as he worked, "--the big explosion when I smashed the rocks. You've got ammunition for your pistol, but you put rifle cartridges in my belt--and service ammunition at that. No wonder they raised the devil with those rocks!"

His fingers were working swiftly now to bind the slender cartridge to the spear. A chipped out hollow in the flint made a seat. He gave silent thanks for Chet Bullard's mistake. Chet had slipped; he had filled Harkness' belt with ammunition that would have been useless for the pistol--but it was just what he needed here.

So intent was he on his task that he hardly heard the yelling chorus from below. It swelled to a din; but his work was finished, and he looked up.

One figure in advance of the rest had been urging them on, and they came in a wild rush now. Walt Harkness scrambled to his feet. Tall and sinewy, his broad shoulders, scantily covered by the rags of blouse that remained, were turned sideways as he raised the spear. The yelling from below swelled louder and more shrill.

This strange one from another tribe--he was unarmed except for one of their own spears. The curious covering on his body was flapping in the breeze. Nothing here, surely, to hold a hunting-tribe in check.

The spear rose slowly in the air. What child of the tribe could not have thrown it better! They came on faster now; the leader had almost reached the place where the spear was dropping down. He must have laughed, if laughter had yet been born in such a breast, at the futile weapon dropping point first among the rocks.

One little sh.e.l.l, a scant three inches long, no thicker than the stylus on milady's desk! But here was service ammunition, as Harkness had said; and in the end of the lead a fulminate cap was buried--and a grain of dense, gray dust!