Saucerdom, myths of, 10–11, 193–95 Scatter of radar beams, 164, 170–71 Schilling Air Force Base, 164, Pl. IVc Schmidt, R., 183 Science, methods of, 3, 289 Science fiction, 1, 9, 17, 19, 23–25, 200 Scientists, views on UFOs, 139, 142, 143, 215, 269–70, 287 Scoutmaster, UFO reported by, 136 Scully, F., 16 Sea gulls, UFO reports based on, 121–22, 130–32, 213 Searchlights on clouds, 263, 266, 283, 285 _Sebago_, U. S. Coast Guard cutter, 182 Sebree, Ky., 223 Secondary reflection of radar beam, 154, 158 Secrecy, alleged Air Force, 37, 69–70, 154, 157, 283; alleged government, 202 Security, national, 147, 271, 275, 289 Shapes of UFOs, 7–8, 206–7 Shaver hoax, 17–21, 25 Sheep Rock saucer, 224 Sheffield Lake, Ohio, 279 Siberian meteor of 1908, 100, 101 Silver iodide, 225 Silver rain, 231–34 “Simultaneous” radar-visual UFO sightings, 5–6, 72, 160–63, 167–71, 182 Sirius, mirages of, 61–63 Size, difficulty of estimating UFO, 14, 54, 131, 181, 260 Skyhooks, 31–33 Smithsonian Astrophysical Observatory, 57, 99, 175, 273 Sound, associated with meteors, 96, 100–1; associated with UFOs, 7, 193; velocity of, 147 Spacecraft, bases for, 228; “landings” by, 183–85, 203–4, 239; motive power of, 192–93; occupants of, 183, 199, 200, 203, 220, 226; signals from, 11, 165; theories about, 10–11, 190–95 Spectra of meteors, 94, 97–98 Spiders, angel hair produced by, 220–24 Sputnik II, 116, 173 St. Elmo’s fire, 176 Stack, formations, 49, 257, 265–66; of coins, 49; of plates, 26 Stars, hypothetical planets of, 10, 216 Statistical summaries of UFO cases, 274 Stones from heaven, 89, 289 Sundogs, 38, 244–47 Superrefractive conditions, 159 Sutton, W. Va., monster, 137 Sylacauga, Ala., meteorite, 88, 230 T Tacker, L. J., 235, 236 Taormina, Sicily, 205, Pl. VIa Taurid meteors, 90, 101, 189 Temperature inversions, displacement of image by, 65; low-level, 155, 157; mirages caused by, 82, 157, 170, 253–54, 269; multiple, 82, 158, 253; radar angels from, 151, 158–60, 170 Tero, 19, 25 Texarkana, Ark., 166 Tin, in alloys, 234; in saucer fragments, 232 Tombaugh, 256, 266–70; UFO reported by, 268 Trans World Airlines flight, UFOs reported from, 70 Travel, interplanetary, 19, 77–78, 216–17; in time, 11 Tremonton, Utah, movies, 130–32 Trindade Island UFO, 206–16, Pl. VIb _True_ magazine, 158 Truth, alleged Air Force concealment, 37, 69–70, 107, 154, 157–58, 220, 277, 283 Tumbleweeds, as UFOs, 57 TV set, malfunction of, 185. _See also_ E-M effects U UFO, as misnomer, 271; defined, 2 UFO reports, Air Force study of, 272–75; commonest explanations of, 105–6, 275; witnesses making, 2, 272