Eras and chronology, 100, 103
Ether, all-pervading, 359
Ethereal medium, the, 192, 217
Eudoxus, 105
Existence, grades of, 234
Faraday, Mr., 325, 336, 340, 356
Figure of the earth, 48, 54, 106
Fire, production of, 241
Flora, reign of, 273, 277
Fluids, properties of, 214, 219, 235, 249
Forests, influence of, 264
Fresnel, M., 216, 218
Frost, hoar, 240
Galvanism, 300 et seq. 345
Galvanometer, 351
Geology, 83
Glass, musical vibrations of, 157; prismatic phenomena, 172, 188; refraction and polarization of light by, 203, 216; impermeable to rays of solar heat, 229, 232
Gravitation, 410
Gravity, variation in, 50
Gymnotus electricus, 357
Heat, the earth’s, 82; solar radiation, 84, 228, 238; of the atmosphere, 132; theory, 244
Herbarium, Tartar, 275
Herschel, Sir William, 79, 228, 236, 384, 392, 397
———, Sir John, 147, 195, 386, 391, 398
Herschel, Miss Caroline, 398
Hipparchus, 93
Horizon, its density of atmosphere, 171
Horoscopes, accordance with astronomy, 106
Humboldt, Von, 132, 134, 146, 258, 280, 348
Ice, formation of, 83; thaw, 247, 271
Icebergs, 123
Indians, their lunar tables, 104
Inequalities, secular and periodic, 17
Insects, 283
Interferences, laws of, 152, 157, 184
Iron, 321
Isothermal lines, the, 267, 269
Italy, the north of, 56
Ivory, Mr., investigations by, 49, 56
Jupiter, the revolution of, 17, 24; satellites of, 38, 79; magnitude of, 67; density, 96
Kater, Captain, 106
Kepler, theory of, 7, 18, 64, 74, 362
La Grange on Periodical Inequalities, 21
Language, its vocal articulations imitated by instruments, 162; primitive tongues, 284
La Place, 22, 37, 73, 101, 103, 115, 135
