Keeler, report on Yerkes telescope, 9; rotation of Saturn, 174; constitution of Saturn's rings, 180; photographic survey of nebulæ, 267 Kelvin, solar combustion, 78, 79 Kepler, suggestion for improved refractor, 3; predicts transit of Mercury, 87; lunar crater, ray-system of, 120, 121; observes new star, 252 Kirchhoff, production of Fraunhofer lines, 75 Kirkwood, theory of asteroid formation, 153; periodic meteors, 214 Kitchiner, visibility of Saturn's satellites, 188 Klein's Star Atlas, 255 L Lampland, photographs of Mars, 137 Langley, heat of umbra of sun-spot, 50; changes in sunspots, 55 Lassell, 4-foot reflector, 37; discovers Saturn's eighth satellite, 187; discovers satellite of Uranus, 196; search for Neptune, 200; discovers satellite of Neptune, 201; drawing of Orion nebula, 262 Leibnitz, mountains, 117 Lemonnier, observations of Uranus, 193 Leonid, meteors, 214, 224, 225, 226 Leonis [gamma], colour of, 236 Leverrier, search for Neptune, 199-201 Lewis, revision of Struve's 'Mensuræ Micrometricæ,' 278 Lick, 36-inch telescope, 8 Light, speed of, 231 Light-year, 230 Lippershey, claim to invention of telescope, 1 Lohrmann, lunar chart of, 122 Lowell, rotation of Mercury, 85; surface of Mercury, 86; surface of Venus, 95; rotation of Venus, 96; 'oases' of Mars, 137, 138; projections on Mars, 141 Lunar observation, 123-125 Lyræ [epsilon], double double, 241, 242; [beta], variable star, 249; spectroscopic binary, 250 Lyra, ring nebula in, 265; photographs of, 266 Lyrid, meteors, 214, 224, 226 M M. 35, cluster, 257; M. 13, number of stars in, 258; M. 92, 259; M. 3 and M. 5, variables in, 259; M. 51, 265 MacEwen, drawing of Venus, 94, 95 Mädler, heights of lunar mountains, 118; lunar chart, 122, 124, 128 Maginus, 120 Magnesium in chromosphere, 73 Maia, 256 Maintenance of solar light and heat, 78, 79 Marius, Simon, description of Andromeda nebula, 264 Markwick, Colonel, 117 Mars, distance, diameter, rotation, year of, phase of, 130-132; oppositions of, 130, 131; polar caps, 132; canals, 135-137; dark areas, 133; 'oases,' 137, 138; atmosphere of, 139, 140; projections on terminator, 141; satellites of, 142-144; visibility of details of, 144 Maunder, Mrs., photographs of coronal streamers, 70 Maunder, E. W., adjustment of equatorial, 22, 23; electrical influence of sun on earth, 63; 'Astronomy without a Telescope,' 238 Mee, Arthur, on amateur observation, 17; visibility of Cassini's division, 183 Melbourne 4-foot reflector, 12 Mellor, lunar chart, 124 Mendenhall, illustration of sun's distance, 48