detailed appearance, 238 Comets, density, 238 composition, 239 orbits, 237 revolution, 236 speed, 238 disintegration, 240 planetary influence, 237 origin, 240 Donati's comet, 238 Encke's comet, 237 Halley's comet, 236 Comet of 1811, 237, 238 of 1843, 238 of 1858, 237 of 1860, 238 of 1882, 238 Comstock, 242 Conon, 95 Constellations, 4, 12, 29, 39, 163 Legends, 71 Copernicus, 15, 198, 248, 257 Copernicus, lunar crater, 311, 312 Cor Carolli, 97, 98 Cor Hydræ, 135 Cor Leonis, 89 Corona, of sun, 215, 216, 217, 221 Corona Borealis, constellation, 29, 101, 102, 103, 104, 111, 113 Coroinds, 104 Legends, 102, 103 Coronis, 184 Corvus, constellation, 127, 136 Legend, 137 Crab, The, 29, 91, 92, 106 Crape Ring, 272 Crater, constellation, 127, 136 Legends, 136, 137 Crow, The, 136, 137 Crystal Spheres, 4, 18, 198, 199 Cubit, 167 Cup, The, 136, 137 Cup of Achilles, 136 Cup of Hercules, 136 Cup of Medea, 136 Cupid, 26, 150, 158 Cupid's Arrow, 129 Cyclops, 19, 21, 169 Cycnus, 125 Cygnus, constellation, 29, 88, 115, 120, 121, 122, 124, 128 Albireo, 115, 122, 124, 125 Deneb, 115, 122 61 Cygni, 122, 134 Coal-sack, 122 Legend, 125 Dædalus, 102 Danae, 66, 68 Danaides, 119 Dark Ages, 11 Dark nebulæ, 122, 157, 178, 208 Dark Sign, 107 Dark Stars, 61, 64, 122 Darkness, God of, 19 David's Chariot, 38 Dawn, Goddess of, 27, 77 Day Star, 211 Dead, King of, 126 Declination, 177 De Greer, 291 Deimos, 32, 268 Delphi, 17 Delphinus, constellation, 25, 29, 74, 84, 129, 158 Legend, as, 130, 131 Demeter, 149 De Mornay, 190 Deneb, 115, 122 Denebola, 90 Diana, 28, 168, 170, 183, 268 Diana's Arrow, 176 Diana's Hound, 180 Dippers, Big, Little, Milk, Pleiades, 186 Big, 8, 37, 38, 39, 45 Little, 8, 40, 45 Milk, 133, 186 Dipper of the Pleiades, 186 Dione, 276 Discord, 32 Doe's Leaps, 42 Doerfel, lunar mountains, 304 Dog-days, 160 Dog Star, 160, 191 Dolphin, 35, 74, 84, 130, 131, 158 Dominion Astrophysics! Observatory, 316 Donati's comet, 238 Double cluster, 65 Double-double, 115, 195 Double stars, 62, 90, 98, 115, 122, 135, 140, 147, 149, 155, 164, 177, 195 Douglas, 225 Draco, constellation, 5, 8, 29, 48, 51, 192 Legends, 48, 49, 105, 107 Dragon's Eyes, 110 Dubhe, 40 Dryden, 23