The American Meteor Society, whose members specialize in the study of meteors and meteorites, for years have collected reports of such phenomena. From a large enough number of good descriptions of a given meteor, astronomers can analyze the data mathematically and determine the meteor’s radiant--the point in the heavens from which it seems to come. The meteor is then identified by its radiant and given an AMS number. For several years the data were published in _Meteoritics_, a journal issued jointly by the Meteoritical Society and the Institute of Meteoritics of the University of New Mexico. Dr. Charles P. Olivier, president of the American Meteor Society, was a contributing editor. The records in _Meteoritics_ for the years 1950 to 1955 list dozens of fireballs, many of them green, that were somehow overlooked by saucer enthusiasts. On August 11, 1950, during the maximum of the Perseid shower, a blue-green fireball (AMS 2336) apparently oval- or cigar-shaped appeared over Washington, Oregon, and Idaho at 7:30 P.M. and was reported by more than 100 witnesses. So brilliant that it showed a noticeable disk, it flew in a horizontal path, silently broke into three pieces, and disappeared[V-8, p. 379]. September 20, the same year, was a big day for meteors. At 1:35 A.M. a giant fireball (AMS 2326) roared over southeastern Illinois from north to south, leaving a luminous train visible in five states and illuminating the sky and countryside from St. Louis to Louisville and from Memphis to Knoxville. The final detonation, over western Kentucky, was heard over an area 1000 miles square and shook buildings from Paducah to Memphis. Fragments showered farms over a twenty-five-mile area, struck five buildings, and penetrated one roof. About fifty pounds of meteorites dropped in Murray, Calloway County, Kentucky, and are now in the Smithsonian Institution in Washington. That same night about 10:45 P.M., fireballs were reported by plane crews flying over a six-state area--Idaho, Wyoming, Utah, Colorado, Arizona, and New Mexico[V-9, p. 115]. Similar fireballs that vanished without trace were reported on September 28, 1953 (AMS 2331); October 4, 1953 (AMS 2330); May 15, 1954; and October 27, 1954 (AMS 2337). The green fireballs still appear now and then, as they always have. None of them has yet changed into a spaceship. _Fallacies about Meteors_ Most flying-saucer enthusiasts still refuse to believe that the green fireballs were natural phenomena. Misinterpreting or distorting the statements made by professional astronomers, they cite the unusual nature of these meteors as proof that they were not meteors at all but machines from another world. Advocates of this belief need more than a refresher course in logic; they also need to learn some facts about meteors. The space-vehicle interpretation rests on a series of mistaken beliefs and illogical conclusions about the nature and behavior of meteors. These false premises may be summarized as follows: