It later appeared in the anthologies "Men of Space and Time" (The Bodley Head, 1953), and "Science Fiction Inventions" (Lancer Books, 1967), as well as the de Camp collection "The Best of L. Sprague de Camp" (Doubleday, 1978). It was credited to de Camp's real name in all publications subsequent to its first appearance. The story has been translated into German. The story is set in a then-future era of the late 1950s, and is presented in the form of a letter from the protagonist, geologist Kenneth Staples, to a prospective employer, explaining why he desires to leave his present job. Staples has been working for paleontologist/inventor Gilmore Platt, whose stereoscopic prospecting device can locate and reveal buried fossils in full detail. From an archeological colleague, Dr. Wilhelmi of Zurich, Platt gets the idea of using an electrolytic bath to restore the specimens he has been retrieving to their original condition, just as the archaeologist can do with corroded bronzes whose atoms have partly dissipated into the surrounding soil. After much experimentation, the two men succeed in restoring complete animals, hair and all, from fossil skeletons and the matrices of rock in which they are embedded. First they reconstruct an extinct Canis dirus (dire wolf), reviving it by applying an electric starter to its heart. They repeat the process with an Arctotherium (short-faced bear), which they are unable to revive and is mounted in the American Museum of Natural History, Stenomylus hitchcocki (an ancestral camel), Trilophodon (a primitive proboscidean), and Dinocyon gidleyi (a bear-dog). They hire Elias, a former circus performer, to manage their growing collection, which they house in a concrete barn with a row of cages down one side. Staples has a close shave, when the Dinocyon escapes its cage in an attempt to prey on the Stenomylus and sees him as an adequate substitute. Platt and Elias come to his rescue, the former with a gun and the latter with a stick of dynamite. It takes the dynamite to do it. Platt then calmly revivifies the bear dog again, but incarcerates it in a stronger cage. It's later sold to the Philadelphia Zoo. It is replaced with a Dinohyus (a piglike animal the size of a buffalo). News of the sale attracts a Mr. Nively, representing the Marco Polo Company, a membership corporation consisting of the whole country's wild animal importers and dealers.