Lake examined the sheets of mica. "We could make windows for the outer caves of these," he said. "Have them double thickness with a wide air s.p.a.ce between, for insulation. As for the quartz crystals . . ."

"Optical instruments," Craig said. "Binoculars, microscopes-it would take us a long time to learn how to make gla.s.s as clear and flawless as those crystals. But we have no way of cutting and grinding them."

Craig went to the east that fall and to the west the next spring. He returned from the trip to the west with a twisted knee that would never let him go prospecting again.

"It will take years to find the metals we need," he said. "The indications are that we never will but I wanted to keep on trying. Now, my d.a.m.ned knee has me chained to these caves . . ."

He reconciled himself to his lameness and confinement as best he could and finished his textbook: GEOLOGY AND MINERAL IDENTIFICATION. He also taught a geology cla.s.s during the winters. It was in the winter of the year four on Ragnarok that a nine-year-old boy entered his cla.s.s; the silent, scar-faced Billy Humbolt.

He was by far the youngest of Craig's students, and the most attentive. Lake was present one day when Craig asked, curiously: "It's not often a boy your age is so interested in mineralogy and geology, Billy. Is there something more than just interest?"

"I have to learn all about minerals," Billy said with matter-of-fact seriousness, "so that when I'm grown I can find the metals for us to make a ship."

"And then?" Craig asked.

"And then we'd go to Athena, to kill the Gerns who caused my mother to die, and my grandfather, and Julia, and all the others. And to free my father and the other slaves if they're still alive."

"I see," Craig said.

He did not smile. His face was shadowed and old as he looked at the boy and beyond him; seeing again, perhaps, the frail blonde girl and the two children that the first quick, violent months had taken from him.

"I hope you succeed," he said. "I wish I was young so I could dream of the same thing. But I'm not . . . so let's get back to the identification of the ores that will be needed to make a ship to go to Athena and to make blasters to kill Gerns after you get there."

Lake had a corral built early the following spring, with camouflaged wings, to trap some of the woods goats when they came. It would be an immense forward step toward conquering their new environment if they could domesticate the goats and have goat herds near the caves all through the year. Gathering enough gra.s.s to last a herd of goats through the winter would be a problem-but first, before they worried about that, they would have to see if the goats could survive the summer and winter extremes of heat and cold.

They trapped ten goats that spring. They built them brush sunshades-before summer was over the winds would have stripped the trees of most of their dry, brown leaves-and a stream of water was diverted through the corral.

It was all work in vain. The goats died from the heat in early summer, together with the young that had been born.

When fall came they trapped six more goats. They built them shelters that would be as warm as possible and carried them a large supply of the tall gra.s.s from along the creek banks; enough to last them through the winter. But the cold was too much for the goats and the second blizzard killed them all.

The next spring and fall, and with much more difficulty, they tried the experiment with pairs of unicorns. The results were the same.

Which meant they would remain a race of hunters. Ragnarok would not permit them to be herdsmen.

The years went by, each much like the one before it but for the rapid aging of the Old Ones, as Lake and the others called themselves, and the growing up of the Young Ones. No woman among the Old Ones could any longer have children, but six more normal, healthy children had been born. Like the first two, they were not affected by the gravity as Earth-born babies had been.

Among the Young Ones, Lake saw, was a distinguishable difference. Those who had been very young the day the Gerns had left them to die had adapted better than those who had been a few years older.

The environment of Ragnarok had struck at the very young with merciless savagery.

It had subjected them to a test of survival that was without precedent on Earth. It had killed them by the hundreds but among them had been those whose young flesh and blood and organs had resisted death by adapting to the greatest extent possible.

The day of the Old Ones was almost done and the future would soon be in the hands of the Young Ones. They were the ninety unconquerables out of what had been four thousand Rejects; the first generation of what would be a new race.

It seemed to Lake that the years came and went ever faster as the Old Ones dwindled in numbers at an accelerating rate. Anders had died in the sixth year, his heart failing him one night as he worked patiently in his crude little laboratory at carrying on the work started by Chiara to find a cure for the h.e.l.l Fever. Barber, trying to develop a strain of herbs that would grow in the lower elevation of the caves, was killed by a unicorn as he worked in his test plot below the caves. Craig went limping out one spring day on the eighth year to look at a new mineral a hunter had found a mile from the caves. A sudden cold rain blew up, chilling him before he could return, and he died of h.e.l.l Fever the same day.

Schroeder was killed by prowlers the same year, dying with his back to a tree and a b.l.o.o.d.y knife in his hand. It was the way he would have wanted to go-once he had said to Lake: "When my time comes I would rather it be against the prowlers. They fight hard and kill quick and then they're through with you. They don't tear you up after you're dead and s...o...b..r and gloat over the pieces, the way the unicorns do."

The springs came a little earlier each year, the falls a little later, and the observations showed the suns progressing steadily northward. But the winters, though shorter, were seemingly as cold as ever. The long summers reached such a degree of heat on the ninth year that Lake knew they could endure no more than two or three years more of the increasing heat.

Then, in the summer of the tenth year, the tilting of Ragnarok-the apparent northward progress of the suns-stopped. They were in the middle of what Craig had called Big Summer and they could endure it-just barely. They would not have to leave the caves.

The suns started their drift southward. The observations were continued and carefully recorded. Big Fall was coming and behind it would be Big Winter.

Big Winter . . . the threat of it worried Lake. How far to the south would the suns go-how long would they stay? Would the time come when the plateau would be buried under hundreds of feet of snow and the caves enclosed in glacial ice?

There was no way he could ever know or even guess. Only those of the future would ever know. On the twelfth year only Lake and West were left of the Old Ones. By then there were eighty-three left of the Young Ones, eight Ragnarok-born children of the Old Ones and four Ragnarok-born children of the Young Ones. Not counting himself and West, there were ninety-five of them.

It was not many to be the beginnings of a race that would face an ice age of unknown proportions and have over them, always, the threat of a chance return of the Gerns.

The winter of the fifteenth year came and he was truly alone, the last of the Old Ones.

White-haired and aged far beyond his years, he was still leader. But that winter he could do little other than sit by his fire and feel the gravity dragging at his heart. He knew, long before spring, that it was time he chose his successor.

He had hoped to live to see his son take his place-but Jim was only thirteen. Among the others was one he had been watching since the day he told Craig he would find metals to build a ship and kill the Gerns: Bill Humbolt.

Bill Humbolt was not the oldest among those who would make leaders but he was the most versatile of them all, the most thoughtful and stubbornly determined. He reminded Lake of that fierce old man who had been his grandfather and had it not been for the scars that twisted his face into grim ugliness he would have looked much like him.

A violent storm was roaring outside the caves the night he told the others that he wanted Bill Humbolt to be his successor. There were no objections and, without ceremony and with few words, he terminated his fifteen years of leadership.

He left the others, his son among them, and went back to the cave where he slept. His fire was low, down to dying embers, but he was too tired to build it up again. He lay down on his pallet and saw, with neither surprise nor fear, that his time was much nearer than he had thought. It was already at hand.

He lay back and let the la.s.situde enclose him, not fighting it. He had done the best he could for the others and now the weary journey was over.

His thoughts dissolved into the memory of the day fifteen years before. The roaring of the storm became the thunder of the Gern cruisers as they disappeared into the gray sky. Four thousand Rejects stood in the cold wind and watched them go, the children not yet understanding that they had been condemned to die. Somehow, his own son was among them- He tried feebly to rise. There was work to do-a lot of work to do . . .

Part 2

It was early morning as Bill Humbolt sat by the fire in his cave and studied the map Craig had made of the plateau's mountain. Craig had left the mountain nameless and he dipped his pen in ink to write: Craig Mountains.

"Bill-"

Delmont Anders entered very quietly, what he had to tell already evident on his face.

"He died last night, Bill."

It was something he had been expecting to come at any time but the lack of surprise did not diminish the sense of loss. Lake had been the last of the Old Ones, the last of those who had worked and fought and shortened the years of their lives that the Young Ones might have a chance to live. Now he was gone-now a brief era was ended, a valiant, b.l.o.o.d.y chapter written and finished.

And he was the new leader who would decree how the next chapter should be written, only four years older than the boy who was looking at him with an unconscious appeal for rea.s.surance on his face . . .

"You'd better tell Jim," he said. "Then, a little later, I want to talk to everyone about the things we'll start doing as soon as spring comes."

"You mean, the hunting?" Delmont asked.

"No-more than just the hunting."

He sat for a while after Delmont left, looking back down the years that had preceded that day, back to that first morning on Ragnarok.

He had set a goal for himself that morning when he left his toy bear in the dust behind him and walked beside Julia into the new and perilous way of life. He had promised himself that some day he would watch the Gerns die and beg for mercy as they died and he would give them the same mercy they had given his mother.

As he grew older he realized that his hatred, alone, was a futile thing. There would have to be a way of leaving Ragnarok and there would have to be weapons with which to fight the Gerns. These would be things impossible and beyond his reach unless he had the help of all the others in united, coordinated effort.

To make certain of that united effort he would have to be their leader. So for eleven years he had studied and trained until there was no one who could use a bow or spear quite as well as he could, no one who could travel as far in a day or spot a unicorn ambush as quickly. And there was no one, with the exception of George Ord, who had studied as many textbooks as he had.

He had reached his first goal-he was leader. For all of them there existed the second goal: the hope of someday leaving Ragnarok and taking Athena from the Gerns. For many of them, perhaps, it was only wishful dreaming but for him it was the prime driving force of his life.

There was so much for them to do and their lives were so short in which to do it. For so long as he was leader they would not waste a day in idle wishing . . .

When the others were gathered to hear what he had to say he spoke to them: "We're going to continue where the Old Ones had to leave off. We're better adapted than they were and we're going to find metals to make a ship if there are any to be found.

"Somewhere on Ragnarok, on the northwest side of a range similar to the Craig Mountains on the plateau, is a deep valley that the Dunbar Expedition called the Chasm.

They didn't investigate it closely since their instruments showed no metals there but they saw strata in one place that was red; an iron discoloration. Maybe we can find a vein there that was too small for them to have paid any attention to. So we'll go over the Craigs as soon as the snow melts from them."

"That will be in early summer," George Ord said, his black eyes thoughtful.

"Whoever goes will have to time their return for either just before the prowlers and unicorns come back from the north or wait until they've all migrated down off the plateau."

It was something Humbolt had been thinking about and wishing they could remedy.

Men could elude unicorn attacks wherever there were trees large enough to offer safety and even prowler attacks could be warded off wherever there were trees for refuge; spears holding back the prowlers who would climb the trees while arrows picked off the ones on the ground. But there were no trees on the plateau, and to be caught by a band of prowlers or unicorns there was certain death for any small party of two or three. For that reason no small parties had ever gone up on the plateau except when the unicorns and prowlers were gone or nearly so. It was an inconvenience and it would continue for as long as their weapons were the slow-to-reload bows.

"You're supposed to be our combination inventor-craftsman," he said to George. "No one else can compare with you in that respect. Besides, you're not exactly enthusiastic about such hard work as mountain climbing. So from now on you'll do the kind of work you're best fitted for. Your first job is to make us a better bow. Make it like a crossbow, with a sliding action to draw and c.o.c.k the string and with a magazine of arrows mounted on top of it."

George studied the idea thoughtfully. "The general principle is simple," he said. "I'll see what I can do."

"How many of us will go over the Craig Mountains, Bill?" Dan Barber asked.

"You and I," Humbolt answered. "A three-man party under Bob Craig will go into the Western Hills and another party under Johnny Stevens will go into the Eastern Hills."

He looked toward the adjoining cave where the guns had been stored for so long, coated with unicorn tallow to protect them from rust.

"We could make gun powder if we could find a deposit of saltpeter. We already know where there's a little sulphur. The guns would have to be converted to flintlocks, though, since we don't have what we need for cartridge priming material. Worse, we'd have to use ceramic bullets. They would be inefficient-too light, and destructive to the bores. But we would need powder for mining if we ever found any iron. And, if we can't have metal bullets to shoot the Gerns, we can have bombs to blast them with."

"Suppose," Johnny Stevens said, "that we never do find the metals to make a ship.

How will we ever leave Ragnarok if that happens?"

"There's another way-a possible way-of leaving here without a ship of our own. If there are no metals we'll have to try it."

"Why wait?" Bob Craig demanded. "Why not try it now?"

"Because the odds would be about ten thousand to one in favor of the Gerns. But we'll try it if everything else fails."

George made, altered, and rejected four different types of crossbows before he perfected a reloading bow that met his critical approval. He brought it to where Humbolt stood outside the caves early one spring day when the gra.s.s was sending up the first green shoots on the southern hillsides and the long winter was finally dying.

"Here it is," he said, handing Humbolt the bow. "Try it."

He took it, noting the fine balance of it. Projecting down from the center of the bow, at right angles to it, was a stock shaped to fit the grip of the left hand. Under the crossbar was a sliding stock for the right hand, shaped like the b.u.t.t of a pistol and fitted with a trigger. Mounted slightly above and to one side of the crossbar was a magazine containing ten short arrows.

The pistol grip was in position near the forestock. He pulled it back the length of the crossbar and it brought the string with it, stretching it taut. There was a click as the trigger mechanism locked the bowstring in place and at the same time a concealed spring arrangement shoved an arrow into place against the string.

He took quick aim at a distant tree and pressed the trigger. There was a tw.a.n.g as the arrow was ejected. He jerked the sliding pistol grip forward and back to reload, pressing the trigger an instant later. Another arrow went its way.

By the time he had fired the tenth arrow in the magazine he was shooting at the rate of one arrow per second. On the trunk of the distant tree, like a bristle of stiff whiskers, the ten arrows were driven deep into the wood in an area no larger than the chest of a prowler or head of a unicorn.

"This is better than I hoped for," he said to George. "One man with one of these would equal six men with ordinary bows."

"I'm going to add another feature," George said. "Bundles of arrows, ten to the bundle in special holders, to carry in the quivers. To reload the magazine you'd just slap down a new bundle of arrows, in no more time than it would take to put one arrow in an ordinary bow. I figured that with practice a man should be able to get off forty arrows in not much more than twenty seconds." George took the bow and went back in the cave to add his new feature. Humbolt stared after him, thinking, If he can make something like that out of wood and unicorn gut, what would he be able to give us if he could have metal?

Perhaps George would never have the opportunity to show what he could do with metal. But Humbolt already felt sure that George's genius would, if it ever became necessary, make possible the alternate plan for leaving Ragnarok.

The weeks dragged into months and at last enough snow was gone from the Craigs that Humbolt and Dan Barber could start. They met no opposition. The prowlers had long since disappeared into the north and the unicorns were very scarce. They had no occasion to test the effectiveness of the new automatic crossbows in combat; a lack of opportunity that irked Barber.

"Any other time, if we had ordinary bows," he complained, "the unicorns would be popping up to charge us from all directions."

"Don't fret," Humbolt consoled him. "This fall, when we come back, they will be."

They reached the mountain and stopped near its foot where a creek came down, its water high and muddy with melting snows. There they hunted until they had obtained all the meat they could carry. They would see no more game when they went up the mountain's canyons. A poisonous weed replaced most of the gra.s.s in all the canyons and the animals of Ragnarok had learned long before to shun the mountain.

They found the canyon that Craig and his men had tried to explore and started up it. It was there that Craig had discovered the quartz and mica and so far as he had been able to tell the head of that canyon would be the lowest of all the pa.s.ses over the mountain.

The canyon went up the mountain diagonally so that the climb was not steep although it was constant. They began to see mica and quartz crystals in the creek bed and at noon on the second day they pa.s.sed the last stunted tree. Nothing grew higher than that point but the th.o.r.n.y poison weeds and they were scarce.

The air was noticeably thinner there and their burdens heavier. A short distance beyond they came to a small rock monument; Craig's turn-back point.

The next day they found the quartz crystals in place. A mile farther was the vein the mica had come from. Of the other minerals Craig had hoped to find, however, there were only traces.

The fourth day was an eternity of struggling up the now-steeper canyon under loads that seemed to weigh hundreds of pounds; forcing their protesting legs to carry them fifty steps at a time, at the end of which they would stop to rest while their lungs labored to suck in the thin air in quick, panting breaths.

It would have been much easier to have gone around the mountain. But the Chasm was supposed to be like a huge cavity scooped out of the plateau beyond the mountain, rimmed with sheer cliffs a mile high. Only on the side next to the mountain was there a slope leading down into it.

They stopped for the night where the creek ended in a small spring. There the snow still clung to the canyon's walls and there the canyon curved, offering them the promise of the summit just around the bend as it had been doing all day.