"I've already told you that it wasn't my discovery," the Archeologist reminded him. "A few years after your expedition left, there was begun a detailed resurvey of Earth's mineral resources. In the course of some deep continental borings, one party discovered a cache--either a very large box or a rather small room--with metallic walls of great strength and toughness. Evidently its makers had intended it for the very purpose of carrying a message down through the ages. It proved to contain artifacts; models of buildings, vehicles, and machines, objects of art, pictures, and books--hundreds of books, along with elaborate pictorial dictionaries for interpreting them. So now we even understand their languages." "Languages?" interrupted the Explorer. "That's queer. Somehow one thinks of an alien species as having just one language." "Like our own, this species had several, though there were some words and symbols that were alike in all their languages. These words and symbols seem to have come down unchanged from their most distant prehistory." The Explorer burst out, "I am not interested in all that dry stuff! Give me the wet! What were they like? How did they live? What did they create? What did they want?" The Archeologist gently waved aside the questions. "All in good time. If I am to tell you everything you want to know, I must tell it my own way. Now that you are back on Earth, you will have to reacquire those orderly and composed habits of thought which you have partly lost in the course of your wild interstellar adventurings." "Curse you, I think you're just trying to tantalize me." The Archeologist's expression showed that this was not altogether untrue. He casually fondled an animal that had wriggled up onto his desk, and which looked rather more like an eel than a snake. "Cute little brute, isn't it?" he remarked. When it became apparent that the Explorer wasn't to be provoked into another outburst, he continued, "It became my task to interpret the contents of the cache, to reconstruct its makers' climb 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."