Cygni, 61, 231; [alpha], 234; [beta], colour of, 236 D Darwin, G. H., evolution of Saturnian system, 186 Dawes discovers crape ring, 178; search for Neptune, 199, 200 Deimos, satellite of Mars, 143 Delphinus, 237 Denning, absence of colour in reflector, 22; measuring sun-spots, 51, 53; on naked-eye views of Mercury, 82; abnormal features on Venus, 94; on canals of Mars, 136; observations of cloud on Mars, 139, 140; changes on Jupiter, 159, 160; rotation of Saturn, 174; visibility of Cassini's division, 182; number of meteor radiants, 225; classification of sporadic meteors, 227; meteoric observation, 227, 228; stationary radiants, 229 Deslandres, calcium photographs of sun, 60; on form of corona, 72; photographs chromosphere and prominences, 74 De Vico's comet, 213 Dew-cap, 39 Digges, supposed use of telescopes, 1 Dollond, John, invention of achromatic, 5; 5-foot achromatics, 6 Donati, comet of 1858, 205, 210; spectrum of comet Tempel, 211 Doppler's principle, 180 Dorpat refractor, 6, 7, 31 Douglass, markings on Venus, 95 Draco, planetary nebula in, 266 Dunér, rotation of sun, 59 E Earth-light on moon, 105 Eclipse, Indian, 1898, 70; 1878, July 29, 72; 1870, December 22, 74 Eclipses, solar, 68-70; of moon, 105, 106 Electra, 256 Electrical influence of sun on earth, 63 Elger on lunar Maria, 111; lunar clefts, 119; lunar chart, 125 Elkin observes transit of comet 1882 (iii.), 212 Encke discovers division in ring of Saturn, 177; search for Neptune, 200 Equatorial mountings, 29-31, 36 Equulei [delta], short-period binary, 245 Erck, Dr. Wentworth, satellites of Mars, 144 Eros, discovery of, distance of, 151; variability of, 152 F Fabricius observes Mira Ceti, 248 Faculæ, 59; rotation period of, 59 Faculides, 60 Finder. See Telescope Finlay, transit of comet 1882 (iii.), 212 Flamsteed, catalogue of stars, 278 Fomalhaut, 234 Fowler, 'Telescopic Astronomy,' 17 Fracastorius, 111 G Galaxy. See Milky Way Galilean telescope. See Telescope, forms of Galileo Galilei, invention of telescope, 2; loss of sight, 47; discovery of phases of Venus, 92; on lunar craters, 112; discovers four satellites of Jupiter, 166; observations of Saturn, 175, 176 Galle discovers Neptune, 200 Gassendi observes transit of Mercury, 87; lunar crater, 119 Geminorum [alpha]. See Castor George III. pensions Herschel, 193 Georgium Sidus, 194 Gore, period of Algol, 250; globular clusters, 259; 'The Stellar Heavens,' 278 Gregorian. See Telescope, forms of Grubb, 27-inch Vienna telescope, 8; on telescopic powers, 41 Gruithuisen, changes on moon, 126 H Hale, calcium photographs of sun, 60 Hall, Asaph, discovers satellites of Mars, 8, 143; rotation of Saturn, 173, 174