Norfolk, luminous owls of, 118–19 Norton County, Kansas, meteor fall at, 102–3 Norway, 248, Pl. VIIb O Odessa, Wash., 62 Office of Scientific Intelligence, 139, 142, 143 Olivier, C. P., 95 Orbit of Martian spaceship, 77–78 Orogrande, N.M., 181 Owls, luminous, 118–19 Ozma, Project, 216–17 P Pacific ocean, 105–6 Page, T. W., 139, 287 Palmer, R. A., 15–21, 23, 26, 227 Pan American Airlines flights, UFOs reported from, 103, 104–6, 256 Pancakes, extraterrestrial, 226–28 Panel of civilian scientists, 138–43; report of, 142 Panic, growth of 1952, 133–35; growth of 1957, 174–76 Paracelsus, 172 Parallel universes, 9 Pelicans, UFO report based on, 130 Perseid meteors, 98, 111, 134 Phantoms, radar. _See_ Angels Phosphorescent organisms, 119–20 Photographs, UFOs in, 122, 130–32, 205–7, 248; by gun-camera, 162–63, 168, 170 Photography, trick, 205, 209, 212, 215 Pibal, 40, 46 _Pile d’assiettes_, 26, Pl. Ib Pilots, UFOs reported by, 70, 92, 103–6, 109–10, 250, 256 Pinched lightning, 177, Pl. Va Plane crashes attributed to UFOs, 11, 23, 35, 154, 192, 276 Planets, extra-solar, 10, 217; mirages of, 66–76, 81–85, 141–42, 253 Plank, V. G., 158 Plato, 18 Port Huron, Mich., 160 Presque Isle, Me., 139 Probability, methods of, 187–88 Project Ozma, 216 Project Twinkle, 94 Propulsion, theories of UFO, 190–93 Publications, UFO, 67, 275–76 Puerto Rico fireball, 99, Pl. IIIb R Radar, as reporter, 145–47; experiments in, 152–53, 157–60; principle of, 147–50; ring angels on, 165–66 Radar echoes, from ice crystals, 71, 164; from moon, 164, 167; interpretation of, 145–47; possible sources of, 164. _See also_ Angels Radarscope, mechanism of, 146 Radar-visual UFOs, 160–63, 167–71 Radio astronomy, 216 Radio noise from space, 217 Radio-TV failures, 181, 184–87 Radio waves, behavior of, 153; scatter of, 153, 164; secondary reflection of, 154, 158; velocity of, 150 Radioactivity, 35, 80, 137, 172, 185 Radiosonde, 39–40, 163 Rain, blue, 234; silver, 231–34 Rapid City, S.D., 167–70 Red Bluff, Calif., 253 Reflections, multiple, 263, 266; UFOs from, 242–44, 248, 249–50, Pls. VIIa, VIIb Refraction, atmospheric, 63–66, 269; of radar beams, 158–60 Refractive index, 159, 160 Rheims, France, 245 Ring angels, 156, 165–66 Robertson, H. P., 139 Robins Air Force Base, 112 Rocket, reported as UFO, 44–45 Rosalia, Wash., 46 Rotating lights of Japan, 73–75 Ruppelt, E. J., 126, 127, 133, 167 Russia, ball lightning in, 178 Ryan case, 68–70 S Salina, Kans., 164, Pl. IVc Salt Lake City, Utah, 245–47 Samford, J. A., 157 Satellites, artificial, 116, 172, 173, 277; natural, 108 Saturn, visitors from, 183, 186, 200, 203 Saturn-like UFOs, 7, 206, 207, 214 Saucer. _See_ UFO