Lignites or beds of brown coal, 283, 284.
Lines, isogonic (magnetic equal deviation), 177, 181-185; isoclinal (magnetis equal inclination), 178, 179, 181-185; isodynamic (or magnetic equal force), 181, 185-194; isogeothermal (chthonisothermal), 219; isobarometric, 315; isothermal, isotheral, and isochimenal, 317, 327, 328, 358.
Line of no variation of horary declination, 183; lower limit of perpetual snow, 329-332; phosphorescent, 113.
Lisbon, earthquake of, 210, 211, 213, 214.
Lord on the limits of the snow-line on the Himalayas, 32.
Lottin, his observations of the Aurora, with Bravais and Siljerstrom, on the coast of Lapland, 195, 200, 201.
Lowenorn, recognized the coruscation of the polar light in bright sunshine, 196.
Lyell, Charles, investigations on the numerical relations of extinct and organic life, 274, 275; nether-formed or hypogene rocks, 249; uniformity of the production of erupted rocks, 257. See notes by Translator, 203, 244, 257.
Mackenzie, description of a remarkable eruption in Iceland, 236.
Maclear on a Centauri, 88; parallaxes and distances of fixed stars, 153; increase in brightness of 'pi' Argo, 153.