Mofettes (exhalations of carbonic acid gas), 215-219.
Monsoons (Indian), 316, 317.
Monticelli on the current of hydrochloric acid from the crater of Vesuvius,
235; crystals of mica found in the lava of Vesuvius, 260.
Moon, the, its relative magnitude, 96; density, 96; distance from the earth,
97; its libration, 98, 163; its light compared with that of the Aurora, 201,
202; volcanic action in, 228.
Moons or satellites, their diameter, distances, rotation, etc., 95-99.
Morgan, John H. "on the Aurora Borealis of Oct. 24, 1847." See Translator's
notes, 194, 199.
Morton, Samuel George, his magnificent work on the American Races, 362.
Moser's images, 202.
Mountains, in Asia, America, and Europe, their altitude, scenery, and
vegetation, 27-30, 238, 347; their influence on climate, natural
productions, and on the human race, its trade, civilization, and social
condition, 291, 292, 299, 300, 327; zones of vegetation on the declivities
of 29, 30, 327-329; snow-line of, 30-33, 330, 331.
Mud volcanoes. See Salses and Volcanoes.
Muller, Johannes, on the modifications of plants and aniimals within certain
limitations, 353.
Muncke on the appearance of Auroras in certain districts, 198.
Murchison, Sir R., account of a large fissure through which melaphyre had
been ejected, 258; classification of fossiliferous strata, 277; on the age
of the Palaeosaurus and Thecodontosaurus of Bristol, 274.
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