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INDEX. 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