L

Lagrange, and the theory of planetary perturbation, 320-322; his assumption of planetary rigidity, 531

L'Aigle meteorites, the, 392

Lalande, and Neptune, 332, 333

Landscapes, lunar, 98

Lane, Mr. J. Homer, 522

Laplace, and the nebular theory, 526; and the satellites of Jupiter, 266; and the theory of planetary perturbation, 320

Lassell, Mr., and Saturn's eighth satellite, 296; discovers Neptune's satellite, 334

Law of gravitation (see Gravitation)

Laws of Planetary Motion (see Planetary Motion)

Lead in the Sun, 50

Ledger, Mr., and Mercury, 163

Leibnitz, lunar mountains named after him, 93

Lemonnier, and Uranus, 312

Leo, and shooting stars, 380, 420

Leonids, attractions of planets on, 386; breadth of stream of, 387; change of shape of, 383; decrease of, 385; enormous number of, 382; historical records, 383; length of stream of, 387; Le Verrier, and the cause of their introduction into the solar system, 388; meteor shoal of, 382; periodic return of, 382; their connection with comets and Professor, Schiaparelli, 388

Leonis g, value of velocity of, 484

Leverage by equatorial protuberance, 498

Le Verrier, and Mars, 214; and the discovery of Neptune, 324-332; and the introduction of the Leonids into the solar system, 388; and the weight of Mercury, 349

Lexell's comet, 370

Libration, 84

Lick Observatory, 16

Light, aberration of, 503-512; velocity of, 261, 262, 265, 505, 512

Linne, 87, 94

Lion, the, 420, 421

Little Bear, the, 412

Little Dog, the, 420

Livy, and meteorites, 393

Lloyd, Provost, 407

Lockyer, Sir Norman, and Betelgeuze, 482; and solar light, 52

London, tides at, 538

Louvain, F. Terby, and Titan, 295

Lowell, Mr., and Mercury, 165

Lunar tides, 548, 549

Lyra, motion of solar system towards, 459

Lyre, the, 424; Nebula in, 469

Lyrids, the, 400