Lespiault, orbits of minor planets, [285]
Le Sueur, spectrum of Jupiter, [291]
Leverrier, discovery of Neptune, [80]-82;
Lexell's comet,[ 98], [367]
distance of the sun, [230] [240]
revolutions of Mercury, [248]
supposed transits of Vulcan, [249]
mass of asteroids, [287]
orbit of November meteors, [332]
Perseids and Leonids, [333]
Lexell, comet of 1770 [ 98], [106] [367]
Liais, supposed transit of Vulcan, [249];
comet of 1861 [326]
division of a comet, [339]
Librations, of Mercury, [247];
of Venus, [251]
of the moon, [266]
Lick, foundation of observatory, [434]
Light, velocity,[ 38], [232] [241];
extinction in space,[ 45]
refrangibility changed by movement, [201]
Ligondès, development of solar system, [316]