 It first appeared in book form in the anthology "From Unknown Worlds" (Street & Smith, 1948).It later appeared in the collections "The Reluctant Shaman and Other Fantastic Tales" (Pyramid, 1970), "The Best of L. Sprague de Camp" (Doubleday, 1978), and "Aristotle and the Gun and Other Stories" (Five Star, 2002), as well as the anthologies "The Fantasy Hall of Fame" (Arbor House, 1983), "The Science Fictional Olympics" (Signet, 1984), "Mermaids!