Gauss, Friedrich, on terrestrial magnetism, 179; his erection. in 1832, of a magnetic observatory on a new principle, 191, 192.
Gay-Lussac, 204, 233, 234, 266, 267, 311, 312, 334, 336.
Geognostic or geological description of the earth's surface, 202-286.
Geognosy (the study of the textures and position of the earth's surface), its progress, 203.
Geography, physical, 288-311; of animal life, 341-346; of plants, 346-351.
Geographics, Ritter's (Carl), "Geography in relation to Nature and the
History of Man," 48, 67; Varenius (Bernhard), General and Comparative
Geography, 66, 67.
Gerard, Capts. A. G. and J. G., on the snow-line and vegetation of the
Himalayas, 31, 32, 331, 332.
German scientific works, their defects, 47.
Geyser, intermittent fountains of, 222.
Gieseke on the Aurora, 200.