Laroche's experiments in optics, 229-233 Latitude, degrees of, 54 Leyden jar, the, 297, 355 Light, mode of measuring its transit, 31; its ana- logy with sound, 148; at- mospheric action on, 163; the sunbeam and prisma- tic experiments, 172; the Newtonian theory, 181; its ethereal medium, 192, 217; allied with rays of caloric, 232; from calo- ric, 241, 358
its velocity calcu-
lated, 412
Lightning, 297, 304
Magnetic pole, the, 310 Magnetism, theory of, 309, 319-340
Malus, M., optical disco- very, 222
Man, frame of, 251; species of, 283
Marine plants, 279 Mars, the planet, 64, 254 Matter, properties of, 129; temperature of, 239
its molecular action
on light, 215 Measures, standard weights and, 106
Meridian, terrestrial, 54 Meridians, whether ellipti- cal, 56; length of a de- gree, 57
Metals, dilation of, 243, 300 Meteoric stones, 405, 406 Milky way, the, 66, 395 Mirage of deserts, 169 Momentum, primitive pla- netary, 13
Moon, the, 34; distance of,
luminous spots of the, 405
and earth, reciprocal influence, 10, 38, 77, 94; calculation of distances, 47; dimensions, 66, 68; theory of tides, 110 Mountains, deposits on, 86; height of, 131; influence, 260
Muscular strength, 134 Music, elements of, 155,157, 159, 160; musical articu- lation, 161
Nature, the laws of, 408, 413
Nautical Almanac, 47
Navigation, new astrono- mical aid to, 30, 46
Nebulæ; clusters of stars, nebulous, and of great magnitude, 395, 397, 399, 402, 404
Needle, the magnetic, 310
Newton, 1, 21, 50, 172, et
Ocean, density of the, 51, 60; of the Pacific, 88; tides, 108
Optics, 172, 179, 210, 223 Orinoco, cataracts of the,
Otaheite, observations by Cook at, 64
Pallas, planet, 68
Papyrus, date of a MS., 106, 115
Parallax, definition, 61 Parry, Sir Edward, 123, 310 Pendulum, oscillations of the, 58-61, 106 Perpetual motion, 323 Phases of the moon, 42 Phenomena of refraction, 166 et seq.; prismatic, 172, 188; of periodical colours, 223
Plane of the centre of gravi- tation, fixed, 22, 24 Planetary eclipses, 46 Planets, theory of the, 11 their masses, 66
the minor, 16, 68
Probabilities, the theory of, 71
Problem of the three bodies, 69
Proportion, law of definite, 129
Quadrupeds, 283
Radiation, principle of, 239 Rays of light, 163, 165, 198, 220
of heat, 228-238 Reflection, phenomena of luminous, 169, 170; law of, 250
Refraction of light, 164, 166;
double image, 199, 202 Retina, images, accidental image, and imagination, 180
Richter's observations at Cayenne, 61
Rivers, declension in the bed of, 53, 80
Ross, Captain, 311
Rotatory motion, 325, 341
of the earth, 33; of
planets, how proven, 72
Salt, rock, permeable to rays of heat, 232
Salt and sugar, attraction or absorption by, 127 Sap, vegetable, experiments, 217
Satellites, law of planetary, 7, 26
Saturn, the planet, 24
Sea-weed, 280
Shadow of the earth, 42 Shell-fish, 282
Shells, marine and fossil, 86 Sidereal astronomy, 386-95 Sight, sense of, 233
Silence of the night, 148 Sirius, 385
Solar eclipses, 44 Solstices, the, 103
Sound, theory of, 134, 137, 224
Snow, perpetual, 260 Space, the immensity of, 407 Spar, Iceland, 199, 202 Spectrum, the solar, 228-38 Stars, the fixed, 23, 65, 333; magnitude of the fixed, 385; first observation made of some, 386; some disappear, and at certain periods re-appear, 387; binary or double stars, 392; colours of, 393 Steam, elasticity and ex- pansion, 248
Sun, the, is the centre of universal gravitation, 7; distance of, 47; parallax of, 63; rotation of, 72; the solstices, 103; the sunbeam, 172
Syrup, physical facts, 215 Temperature, observations, 82, 85, 256, 271,272
Vegetation influenced by the decrease of temperature, 272; extraordinary, 273; comparison of various ex- amples of, 274
Velocity of light, 33, 187; of sound, 144; of electri- city, 151; of coloured rays, 226
Venus, the transits of, 62; climate of, 255
Voltaic electricity, 303, 332
vibrations, aërial, 141, 224; of elastic bodies, 152; of sonorous bodies, 154; of light, 219
Water, a conveyer of sound, 145, 152
Waves, description, 118 Week, 100
Year, the, and the seasons, 93, 97, 102
Zinc, oxidation of, 300
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