_Principia_, publication of, 65 Proctor, R. A., attack of, 116 Ptolemy, Claudius, catalogue of, 185 Publication, the problem of, 48, 92 Quadrant, Heineken, 59 ----, the iron, 73 Railway time, 152 Rain gauge, 238 Record rooms, 132 Reflection, observation by, 196 Reflex zenith room, 304 ---- ---- tube, 131 Refraction, effects of, 194 Right ascension, 186, _et seq._ Roberts, Dr. Isaac, 301 Römer, discovery of, 78 Rosse, Lord, 268 Royal Society and Flamsteed, 46, _et seq._ Saint-Pierre, Le Sieur de, proposal of, 23, 32 Sappho, 224 Saros of the moon, 67 Satellites, discovery of, 296 Saturn, atmosphere of, 279; satellites of, 296 Schaeberle's comet, 280 Schedar, 184 Schiehallion, attraction of, 94 Schönfeld, 287 Scotchmen, anecdote of, 146 Sharp, Abraham, 46 Sheepshanks, Rev. James, on Airy, 107 Shuckburgh equatorial, 309 Sidereal clock, 160 Sirius, 287 Sloane, Dr., 50 'Smith, Mr.,' his chronometer, 179 Solar photographs, 257 ---- storms, 261, 282 Sound waves, 271 South, Sir James, 105, 114 South-east equatorial, the, 132, 221 Spectroscope, use of, 267 Spectroscopic Department, 266, _et seq._ Spots, sun, 251, _et seq._, 281 Staff of Observatory, 137; work of, 139, _et seq._ Standard time, 21 Stars, observations of, 156, 176, 188; origin of names of, 183; movements of, 187; catalogues of, 198, 284, _et seq._; composition of, 268, _et seq._; colour of, 271; classes of, 287; census of, 287; photographs of, 288, _et seq._; motions of, 303, 315 Story, Mr. A. M., 97 Sun, distance of the, 74, 224; spots on, 251, _et seq._, 281; eclipses of, 263, _et seq._; chromosphere of, 268; motions of, 315 Sunshine recorder, 238 Swiss time, 155 Tebb, Mr. W., 58 Tebbutt's comet, 280 Telescope, the great transit, 156 ----, 28-inch, 275 ----, astrographic, 289 ----, Shuckburgh, 309 ----, Thompson, 256, 279, 296 Thalèn, 268 Thermometer, use of, 192, 234 Thome, Dr., 287 Thompson photo-heliograph, 256, 279, 296 Time ball, 162 ---- Department, the, 146, _et seq._ ---- desk, 161 ----, foreign, 153 ---- signals, 162 ---- standard, 21 Transit, Halley's, 73 Transit circle, the, 114; mode of observation with, 188, _et seq._ Transit circle, Troughton's, 98 ---- Department, 181, _et seq._ ---- observations, number of, 140 ---- pavilion, 126, 175 ---- room, 128, 147 Troughton's transit circle, 98 Uranus, discovery of, 217; atmosphere of, 279; satellites of, 296 Vanes, use of, 238 Venus, distance of, 223 Victoria, 224 Visitors, the Board of, 53; censures Pond, 99; work of, 106; constitution of, 144 Visitors to Observatory, 175 Warrant for Flamsteed's salary, 39 Water telescope, 304 Weather predictions, 229, _et seq._ Winds, study of, 237