from animalism and savagery to civilization, their rather rapid spread across the world's surface, their first fumbling attempts to escape from the Earth."

"They had spaceships?"

"It's barely possible. I rather hope they did, since it would mean the chance of a survival elsewhere, though the negative results of your expedition rather lessen that." He went on, "The cache was laid down when they were first attempting space flight, just after their discovery of atomic power, in the first flush of their youth. It was probably created in a kind of exuberant fancifulness, with no serious belief that it would ever serve the purpose for which it was intended." He looked at the Explorer strangely. "If I am not mistaken, we have laid down similar caches."

After a moment the Archeologist continued, "My reconstruction of their history, subsequent to the laying down of the cache, has been largely hypothetical. I can only guess at the reasons for their decline and fall. Supplementary material has been very slow in coming in, though we are still making extensive excavations at widely separated points. Here are the last reports." He tossed the Explorer a small metal-leaf pamphlet. It flew with a curiously slow motion.

"That's what struck me so queer right from the start," the Explorer observed, putting the pamphlet aside after a glance. "If these creatures were relatively advanced, why haven't we learned about them before? They must have left so many things—buildings, machines, engineering projects, some of them on a large scale. You'd think we'd be turning up traces everywhere."

"I have four answers to that," the Archeologist replied. "The first is the most obvious. Time. Geologic ages of it. The second is more subtle. What if we should have been looking in the wrong place? I mean, what if the creatures occupied a very different portion of the Earth than our own? Third, it's possible that atomic energy, out of control, finished the race and destroyed its traces. The present distribution of radioactive compounds throughout the Earth's surface lends some support to this theory.

"Fourth," he went on, "it's my belief that when an intelligent species begins to retrogress, it tends to destroy, or, rather, debase all the things it has laboriously created. Large buildings are torn down to make smaller ones. Machines are broken up and worked into primitive tools and weapons. There is a kind of unraveling or erasing. A cultural Second Law of Thermodynamics begins to operate, whereby the intellect and all 

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