Did they never have night thoughts? Was it possible that there could exist in the universe a reasoning being of a high order, which was never for an instant paralyzed by the sudden question, the terror of seeing through to the meaninglessness of action, the blindness of knowledge, the barrenness of having been born at all? "Only upon this firm foundation of unyielding despair," a famous atheist once had written, "may the soul's habitation henceforth be safely built."

Or could it be that the Lithians thought and acted as they did because, not being born of man, and never in effect having left the Garden in which they lived, they did not share the terrible burden of original sin? The fact that Lithia had never once had a glacial epoch, that its climate had been left unchanged for seven hundred million years, was a geological fact that an alert theologian could scarcely afford to ignore. Could it be that, free from the burden, they were also free from the curse of Adam? And if they were-could men bear to live among them?

"I have some questions to ask you, Chtexa," the priest said after a moment. "You owe me no debt whatsoever-it is our custom to regard all knowledge as community property-but we four Earthmen have a hard decision to make shortly. You know what it is. And I don't believe that we know enough yet about your planet to make that decision properly."

"Then of course you must ask questions," Chtexa said immediately. "I will answer, wherever I can."

"Well then-do your people die? I see you have the word, but perhaps it isn't the same in meaning as our word."

"It means to stop changing and to go back to existing," Chtexa said. "A machine exists, but only a living thing, like a tree, progresses along a line of changing equilibriums. When that progress stops, the entity is dead."

"And that happens to you?"

"It always happens. Even the great trees, like the Message Tree, die sooner or later. Is that not true on Earth?"

"Yes," Ruiz-Sanchez said, "yes, it is. For reasons which it would take me a long time to explain, it occurred to me that you might have escaped this evil."

"It is not evil as we look at it," Chtexa said. "Lithia lives because of death. The death of plants supplies our oil and gas. The death of some creatures is always necessary to feed the lives of others. Bacteria must die, and viruses be prevented from living, if illness is to be cured. We ourselves must die simply to make room for others, at least, until we can slow the rate at which our people arrive in the world-a thing impossible to us at present."

"But desirable, in your eyes?"

"Surely desirable," Chtexa said. "Our world is rich, but not inexhaustible. And other planets, you have taught us, have peoples of their own. Thus we cannot hope to spread to other planets when we have overpopulated this one."

"No real thing is ever exhaustible," Ruiz-Sanchez said abruptly, frowning at the iridescent floor. "That we have found to be true over many thousands of years of our history."

"But exhaustible in what way?" Chtexa said. "I grant you that any small object, any stone, any drop of water, any bit of soil can be explored without end. The amount of information, which can be gotten from it is quite literally infinite. But a given soil can be exhausted of nitrates. It is difficult, but with bad cultivation it can be done. Or take iron, about which we have been talking. To allow our economy to develop a demand for iron which exceeds the total known supply of Lithia-and exceeds it beyond any possibility of supplementation by meteorites or by import-would be folly. This is not a question of information. It is a question of whether or not the information can be used. If it cannot, then limitless information is of no help."

"You could certainly get along without more iron if you had to," Ruiz-Sanchez admitted. "Your wooden machinery is precise enough to satisfy any engineer. Most of them, I think, don't remember that we used to have something similar: I've a sample in my own home. It's a kind of timer called a cuckoo clock, nearly two of our centuries old, made entirely of wood except for the weights, and still nearly a hundred per cent accurate. For that matter, long after we began to build seagoing vessels of metal, we continued to use lignum vitae for ships' bearings."

"Wood is an excellent material for most uses," Chtexa agreed. "Its only deficiency, compared to ceramic materials or perhaps metal, is that it is variable. One must know it quite well to be able to assess its qualities from one tree to the next And of course complicated parts can always be grown inside suitable ceramic molds; the growth pressure inside the mold rises so high that the resulting part is very dense. Larger parts can be ground direct from the plank with soft sandstone and polished with slate. It is a gratifying material to work, we find."

Ruiz-Sanchez felt, for some reason, a little ashamed. It was a magnified version of the same shame he had always felt back home toward that old Black Forest cuckoo clock. The electric clocks elsewhere in his hacienda outside Lima all should have been capable of performing silently, accurately, and in less space-but the considerations which had gone into the making of them had been commercial as well as purely technical. As a result, most of them operated with a thin, asthmatic whir, or groaned softly but dismally at irregular hours. All of them were "streamlined," oversized and ugly. None of them kept good time, and several of them, since they were powered by constant-speed motors driving very simple gearboxes, could not be adjusted, but had been sent out from the factory with built-in, ineluctable inaccuracies.

The wooden cuckoo clock, meanwhile, ticked evenly away. A quail emerged from one of two wooden doors every quarter of an hour and let you know about it, and on the hour first the quail came out, then the cuckoo, and there was a soft bell that rang just ahead of each cuckoo call. Midnight and noon were not just times of the day for that clock; they were productions. It was accurate to a minute a month, all for the price of running up the three weights which drove it, each night before bedtime. The clock's maker had been dead before Ruiz-Sanchez was born. In contrast, the priest would probably buy and jettison at least a dozen cheap electric clocks in the course of one lifetime, as their makers had intended he should; they were linearly descended from "planned obsolescence," the craze for waste which had hit the Americas during the last half of the previous century.

"I'm sure it is," he said humbly. "I have one more question, if I may. It is really part of the same question. I have asked you if you die; now I should like to ask how you are born. I see many adults on your streets and sometimes in your houses-though I gather you yourself are alone-but never any children. Can you explain this to me? Or if the subject is not allowed to be discussed-"

"But why should it not be? There can never be any closed subjects," Chtexa said. "Our women, as I'm sure you know, have abdominal pouches where the eggs are carried. It was a lucky mutation for us, for there are a number of nest-robbing species on this planet."

"Yes, we have a few animals with a somewhat similar arrangement on Earth, although they are viviparous."

"Our eggs are laid in these pouches once a year," Chtexa said. "It is then that the women leave their own houses and seek out the man of their choice to fertilize the eggs. I am alone because, thus far, I am no woman's first choice this season; I will be elected in the Second Marriage, which is tomorrow."

"I see," Ruiz-Sanchez said" carefully. "And how is the choice determined? Is it by emotion, or by reason alone?"

"The two are in the long run the same," Chtexa said. "Our ancestors did not leave our genetic needs to chance. Emotion with us no longer runs counter to our eugenic knowledge. It cannot, since it was itself modified to follow that knowledge by selective breeding for such behavior."