Many persons have contributed to the material in this book. Members of the United States Air Force have generously helped us to collect the basic facts, and have shown amazing patience in answering hundreds of small questions of detail. In particular, we wish to thank Col. Philip G. Evans, Col. Edward H. Wynn, Lt. Col. William T. Coleman, Lt. Col. Robert J. Friend, Lt. Col. Lawrence J. Tacker, Major Carl R. Hart, and Sgt. David Moody. Others who have helped us in various ways include Dr. Isaac Asimov, Mr. Carleton Atherton, Miss C. M. Botley, Mr. Wilfred J. Chambers, Mr. Albert M. Chop, Dr. Leon Davidson, Mr. Charles W. Dean, Mr. John F. Gifford, Mr. Richard Hall, Mr. Theodore Hieatt, Prof. Seymour B. Hess, Prof. J. Allen Hynek, Dr. Luigi G. Jacchia, Mr. Craig L. Johnson, Dr. Urner Liddell, Mr. Oscar Main, Prof. Charles A. Maney, Dr. Richard E. McCrosky, Mr. John W. McLellan, Capt. William B. Nash, Dr. Thornton W. Page, Dr. Vernon G. Plank, the late Dr. H. P. Robertson, Dr. Donald H. Robey, Dr. Carl Sagan, Dr. Clyde W. Tombaugh, Mr. John Walkin, Prof. Fred L. Whipple, and Mr. John G. Wolbach. D.H.M. L.G.B. THE WORLD OF FLYING SAUCERS _Chapter_ I THE SAUCER WORLDS Thousands of reports of “flying saucers,” “unidentified flying objects,” or “UFOs” have appeared in print during the last fifteen years. Although most of the things seen have later been explained as unusual but normal phenomena, some enthusiasts continue to regard them as mysterious, and thus help perpetuate the myth that the “saucers” are actually spaceships from other planets, busily carrying out a patrol of the earth. This saucer myth owes an unacknowledged debt to Charles Fort, a talented reporter, writer, and self-appointed gadfly of science. With a strong curiosity about the world of nature but without training in the disciplines of research, Fort liked to challenge scientists in general and astronomers in particular with tales of “impossible” happenings culled from books of folklore, old journals, and newspapers. He mistrusted orthodox knowledge because, he believed, it smugly damned to oblivion all reports of marvels that it could not explain: pyrogenic persons; rains of fish, frogs, and stones; accounts of telepathy, teleportation, the vanishing of human beings, luminous objects in the sky. Although he never claimed that he believed the stories himself, Fort enjoyed collecting them and before his death in 1932 had completed four volumes of these anecdotes. Science-fiction writers have found an inexhaustible mine of ideas in _The Book of the Damned, New Lands, Lo!_, and _Wild Talents_, which also provide the chief elements of the saucer myth: