Novelette. Illustrated by F. Kramer. Part of the Rull Series Appeared in the collected works [i]The Proxy Intelligence and Other Mind Benders[/i], published in 1971 and [i]The Gryb[/i], published in 1976 and reprinted in 1978 and 1980 under the title [i]The Gryb[/i]. Appeared in the anthology [i]Beachheads in Space[/i], published in 1952 and reprinted in 1957 and 1964.