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 space 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 glass 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 damned 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 class during the winters. It was in the winter of the year four on Ragnarok that a nine-year-old boy entered his class; 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 grass 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 grass 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 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 Hell 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 Hell Fever the same day.
Schroeder was killed by prowlers the same year, dying with his back to a tree and a bloody knife in his hand. It was the way he would have wanted to go—once he had said to Lake:
"When my times 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 slobber 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.