—, tables, J. de Wallestein, ix, 394.
Meteorology, J. D. Forbes on the progress of, xl, 318.
Metre, French, compared with an English yard, xxi, 382.
Mexican Andes, ascent of Popocatepetl, xxviii, 220.
Mexico, geological character, climate, uses of obsidian, &c. in, xvi, 160.
—, geological remarks relating to, W. Maclure, xx, 406.
—, discovery of mummies near Durango, xxxvi, 200.
—, silver mines of, xxiv, 226.
—, meteoric iron at Charcas, xxviii, 288.
Mica, containing potash and lithia, xxxvii, 356.