, 234;
their transits, 62, 234

Kant, 334

Kapteyn, 284, 313

Keeler, 315, 337

Kelvin, Lord, 129

Kepler, 44, 152, 172, 237, 242, 245, 253, 311

Kinetic theory, 156, 202, 212, 226, 231, 239, 336

King, L.W., 84

_Knowledge_, 87

Labrador, 97

Lacus Somniorum, 197

"Lake of Dreams," 197

Lalande, 244, 283

Lampland, 215, 219

Langley, 95, 127

Laplace, 190, 333

Laputa, 224

Le Maire, 115

Le Verrier, 24, 236, 243-244, 275

Lead, 145

Leibnitz Mountains (lunar), 200

Leo (constellation), 270, 295-296

Leonids, 270-272, 274-275

Lescarbault, 25

Lewis, T., 303

Lexell's Comet, 250

Lick Observatory, 31, 98, 117-118, 215, 232, 303, 305, 315;
Great Telescope of, 117, 215, 237

"Life" of an eclipse of the moon, 80;
of the sun, 77-78

Life on Mars, Lowell's views, 217-218;
Pickering's, 221;
Wallace's, 221-223

Light, no extinction of, 322-324;
rays of, 127;
velocity of, 52, 235-236;
white, 121

"Light year," 53, 280

Lindsay, Lord, 94

Linne (lunar crater), 205

Liouville, 190

Lippershey, 108

Liquid-filled lenses, 116

_Locksley Hall_, 296;
_Sixty Years After_, 109

Lockyer, Sir Norman, 73, 94, 236, 335

Loewy, 119, 206

London, eclipses visible at, 87-88, 91-92

Longfellow, 88

Lowell Observatory, 215, 219, 233-234

Lowell, Percival, 155, 212-213, 215-221

Lucifer, 150

Lynn, W.T., 219, 263

Lyra (constellation), 177, 283, 294-295, 307, 315, 347

Maedler, 206, 284

Magellanic Clouds, 317

Magnetism, disturbances of terrestrial, 143, 283

Magnitudes of stars, 287-289

Major planets, 229-230

"Man in the Moon," 197

_Manual of Astronomy_, 166

Maps of the moon, 206

Mare Imbrium, 197

Mare Serenitatis, 205

Mars, 20, 22-23, 31-32, 34, 37, 109, 155, 210-225, 234;
compared with earth and moon, 221, 225;
polar caps of, 212-214, 216;
satellites of, 26, 223-224;
temperature of, 213, 216, 221-222

Mass, 38;
of a star, how determined, 305

Masses of celestial bodies, how ascertained, 42;
of earth and moon compared, 42;
of sun and planets compared, 39

Maunder, E.W., 87, 143, 219

Maunder, Mrs., E.W., 96, 144

Maxwell, Clerk, 237

Mayer, Tobias, 206, 283

McClean, F.K., 98

Mean distance, 46

"Medicean Stars," 232

Mediterra