Maskelyne, Nevil, fifth Astronomer Royal, 85; practical work of, 86; Astronomer Royal, 91; his work, 92; his publications, 92; his observations and work, 92, _et seq._; his death, 94; his character, 97; recommends his successor, 97; his mural circle, 101 Mean solar clock, 160 Mean time, 152 Meldrum, Dr., on sun spots, 263 Meridian, the, 149 Merz telescope, 279 Meteorological Department, work of, 133; description of, 228, _et seq._ Micrometers, use of, 309 Microscopes, use of, 188 Milky Way, 288 Miller, Professor, 268 Milne, Professor, on earth movements, 201 Minor planets, 222 Molyneux, Samuel, 75 Moon, observation of the, 212, _et seq._; eclipses of, 266 Moore, Sir Jonas, 30; death of, 42 Morin, 33 Mounting telescopes, modes of, 310 Mudge, Thomas, 94 Mural arc, 7-feet, 46 Mural circles, 101, 196 Names of stars, origin of, 183 Nares, Sir George, 170 _Nautical Almanac_, the, 22, 23, 92 Navigation, state of primitive, 17 Neptune, discovery of, 217; atmosphere of, 280; satellite of, 298 New altazimuth, the, 132, 210 New Observatory, the, 136, 275 New stars, 268 Newcomb, Professor, on growth of Observatory, 124; on Greenwich observations, 207 Newton, Sir I., his absent-mindedness, 31; his trouble with Flamsteed, 46, _et seq._; on Kepler's laws, 65; his _Principia_, 65; his pressure on Halley, 68; his discovery of gravitation, 206 North terrace, the, 126 Northumberland equatorial, 218 Nutation of the earth, 80 Observation, modes of, 156, 176, 188; by reflection, 196; of comets, 224 Observatory, Greenwich, work of, 13; foundation of, 23; warrant for building, 40; position of, 41; foundation stone laid, 42; condition of, 79; enlargement of, 112; recent extensions of, 120; description of, 124, _et seq._; staff of, 137; work of, 139, _et seq._; visitors to, 175; new altazimuth building, 211; magnet house, 228; magnetic pavilion, 245; new Observatory, 275; future of, 283; reflex zenith room, 304; objects of, 316 Occultations by the moon, 212, _et seq._ Octagon room, 125, 238, 242 Oldenburg, Mr., 30 Orion nebula, 268, 301 Parallax of stars, 303 Paramour, the, 65 Paris, conference at, 288 ----, noon at, 151 Philip III., offer of, 19 Photographic registration, 244, 247, 252, 255; refractors, 288 Photographs, star, 290 Photo-heliographs, 252, _et seq._, 279 Piazzi, discovery of, 222 Pleiades, the, 301 Polar plumes of the corona, 264 Polaris, 188 Pole-star, variation of, 184 Pond, John, sixth Astronomer Royal, his life, 97; his reign, 98; his salary, 98; his assistants, 98; his observations, 99; censured by Visitors, 99; his observations of stars, 303 Pound, James, 73 Precession of earth's axis, 184