Mathieu on the augmented intensity of the attraction of gravitation in
volcanic islands, 167.
Mayer, Tobias, on the motion of the solar system, 146, 148.
Mean numerical values, their necessity in modern physical science, 81.
Melloni, his discoveries on radiating heat and electro-magnetism, 49.
Menzel, unedited work by, on the flora of Japan, 347.
Messier, comet, 108; nebulous spot resembling our starry stratum, 151.
Metamorphic Rocks. See Rocks.
Meteorology, 311-339.
Meteors, see A?‘rolites; meteoric infusoria, 345, 346.
Methone, Hill of, 240.
Meyen on forming a thermal scale of cultivation, 324; on the reproductive
organs of liverworts and algae, 341.
Meyer, Hermann von, on the organization of flying saurians, 274.
Milky Way, its figure, 89; views of Aristotle on, 103; vast telescopic
breadth, 150; Milky Way of nebulous spots at right angles with that of the
stars, 151.
Minerals, artificially formed, 268, 269.
Mines, greatest depth of, 157, 159; temperature, 158.
Mist, phosphorescent, 142.
Mitchell, protracted earthquake shocks in North America, 211.
Mitscherlich on the chemical origin of iron glance in volcanic masses, 234;
chemical combinations, a means of throwing a clear light on geognosy, 256;
on gypsum, as a uniaxal crystal, 259; experiments on the simultaneously
opposite actions of heat on crystalline bodies, 259; formation of crystals
of mica, 260; on artificial mineral products, 268, 271.
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