Mercury, elongations of, 81; diameter of, 82; orbit, 83; bulk, weight, density, reflective power, 83; phases, 84; surface, 84; rotation period, 85; transits, 87, 88; anomalous appearances in, 87 Merope, 256 Merz, Cambridge (U.S.A.), and Pulkowa refractors, 6 Messier, lunar crater, 126; 'the comet ferret,' 219; catalogue of nebulæ, 258 Meteors, 222 _et seq._; shower of 1833, 223; of 1866, 224; Perseid, 214, 224, 225; Leonid, 214, 224, 225; Lyrid, 214, 224, 226; Andromedes, 214, 215, 224, 225; radiant point, 223, 224; sporadic, 226; observation of, 227-229 Metius's claim to invention of telescope, 1 Milky Way, 239; clustering of stars towards, 240; nebulæ in, 240 Mira, [omicron] Ceti, 248; period of, 249 Mizar, 240, 241 Montaigne, 219 Month, lunar and sidereal, 103 Moon, size, orbit, area, volume, density, mass, force of gravity, 100; lunar tides, 101, 102; phases, 102; synodic period, 103; reflective power, 104; 'old moon in young moon's arms,' 104; earth's light on, 105; lunar eclipses, 105, 106; 'black eclipses,' 105; Maria of, 109-111; craters of, 109, 112-114; mountain ranges, 109, 116-118; clefts or rills, 109, 118, 119; ray systems, 109, 120, 121; atmosphere of, 126; evidence of change, 127, 128 Mountings. See Telescope N Nasmyth, willow-leaf structure of solar surface, 57; lunar clefts, 119; on lunar ray systems, 121; and Carpenter, lunar chart, 125; on powers for lunar observation, 127 Nebula of Orion, 261-263; drawings of, 262; photographs, 262; distance of, 263; of Andromeda, 263, 264; photographs of, 264; spectrum, 264 Nebulæ, few in neighbourhood of Galaxy, 240; Messier's catalogue of, 258; gaseous, 260 _et seq._; spiral, 263-265; ring, 265; planetary, 266; number of, 267 Neison on lunar walled plains, 115, 120; lunar chart, 125 Neptune, 148, 196 _et seq._; diameter, distance, period, spectrum, satellite of, 201 Newall, 25-inch refractor, 8 Newcomb on scale of solar operations, 77, 78; on markings of Venus, 93; phosphorescence of dark side of Venus, 97; ratio of stellar increase, 235; 'Astronomy for Everybody,' 238; stars in galaxy, 240; spectroscopic binaries, 248; on Nova Persei, 254; on constitution of stars, 268; apex of solar path, 271 Newton, Sir Isaac, invents Newtonian reflector, 10 Nice, 30-inch refractor, 8 Nichol on M. 13, 258 Nilosyrtis, 145 Noble, method of observing sun, 67; visibility of Saturn's satellites, 188