Magnussen, Soemund, description of 

 remarkable eruption, in Iceland. 

 234. 



Mahlmam, Wilhelm, south-west direc- 

 tion of the aerial current in the 

 middle latitudes of the temperate ^ 

 zone, 32-2. 



Mairun, on the Zodiacal light, 127, 

 128, 131; his opinion that the Sun 

 is a nebulous star, 130. 

 Malapert, annular mountain, 83. 

 Malle, Dureau de la, 220. 

 Man, general view of, 360369; 

 pr<ols of the flexibility of his nature, 

 6; re&ults of his intellectual pro- 

 gress, :34, 35; geographical distribu- 

 tion of races, 360 366; on the as- 

 sumption of superior and inferior 

 races, 361 368; his gradual recog- 

 nition of the bond of humanity, 368, 

 369. 



Mantell, Dr., his ' Wonders of Geo- 

 logy,' see notes by Translator, 25, 

 45,' 46, 198, 277, 280, 284, 266, 287, 

 291; 'Medals of Creation,' 26,273, 

 286,291. 

 Margarita Philosophica, by Gregory 



Reisch, 39. 



Marias, Simon, first described the ne- 

 bulous spots in Andromeda and 

 Orion, 127. 



Martins, observations on polar bands, 

 192; found that air collected at 

 Faulhoi-H contained as much oxygen 

 as the air of Paris, 317; on the dis- 

 tribution of the quantity of rain in 

 Central Europe, 341 ; doubts on the 

 greater drvness of mountain air, 

 342. 

 Matthiessen, letter to Arago on the 



Zodiacal light, 132. 

 Mathieu, on the augmented intensity 

 of the attraction of gravitation in 

 volcanic islands, 159. 

 Mayer, Tobias, on the motion of the 



Solar System, 136, 138. 

 Mean numerical values, their necessity 



in mi dern physical science, 64. 

 Melloni, his discoveries on radiatin 



heat and electro-magnetism, 29. 

 Menzel, unedited work by, on the flora 



of Japan, 356. 

 Messier, comet, 94; nebulous spot re- 



spinbliug ir.ir starry stratum, 141. 

 Metarnorphic Rocks. See Hocks. 



Meteorology, 31" 346. 

 Meteors, see Aerolites ; meteoric infu- 

 soria, 354, 355. 

 Methone, Hill of, 239. 

 Meyen, on forming a thermal scale of 

 cultivation, 331 ; on the reproduc- 

 tive organs of liverworts and alese. 

 350. 



Meyer, Hermann Von, on the organi- 

 zation of flying saurians, 276. 

 Milky Way," its figure, 73; views of 

 Aristotle on, 88: vast telescopic 

 breadth, 140, 141; milky way' of 

 nebulous spots at right angles with 

 that of the stars, 141, 142. 

 Minerals, artificially formed, 269, 270. 

 Mines, greatest depth of, 148, 149, 



150; temperature, 149. 

 Mist, phosphorescent, 131. 

 Mitchell, protracted earthquake shocks 



in North America, 207. 

 Mitscherlich, on the chemical origin of 

 iron-glance in volcanic masses, 232; 

 chemical combinations, a means of 

 throwing a clear light on geognosy, 

 256; on gypsum, as a uniaxai crys- 

 tal, 259; experiments on the simul- 

 taneously opposite actions of heat on 

 crystalline bodies, 260; formation 

 of crystals of mica, 26 1 ; on artificial 

 mine'ral products, 269, 270, 273. 

 Mot'ettes, (exhalations of carbonic acid 



gas), 2 11 216. 

 Monsoons, (Indian), 322, 323. 

 Monticelli, on the current of hydro- 

 chloric acid from the crater of Vesu- 

 vius. 233; crystals of mica found in 

 the lava of Vesuvius, 261. 

 Moon, the, its relative magnitude, 80; 

 density, 80, 81; distance from the 

 earth, 81, 82; its libration, 83, 155; 

 its light compared with that of the 

 Aurora, 196, 197; volcanic action 

 in, 226. 

 MODUS, or satellites, their (iiameter, 



distances, rotation, &c. , 80 84. 

 Morgan, John H., 'on the aurora bo- 

 realis of Oct. 24, 1 847.' See Trans- 

 lator's notes, 188,194. 

 Morton, Samuel George, his magnifi- 

 cent work on the American Races, 

 3f>2. 



Moser's images, 197. 

 Mountains, in Asia, America, and 

 Europe, their altitude scenery, and 



