Ocean, density of the, 51, 60; of the Pacific, 88; tides, 108
Optics, 172, 179, 210, 223
Orinoco, cataracts of the,
Precession and nutation, 93, 95
Probabilities, the theory of, 71
Problem of the three bodies, 69
Otaheite, observations by Proportion, law of definite,
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
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
, description of, 74, 96 Scoresby, Captain, 168
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
Thermo-electricity, 356
Thermometer, the, 123, 125 Thunder, 151
Tides, described, 108
Time, mean solar, 98; deci- mal division, 98, 107 Torpedo, the, 308, 356 Tourmaline, 209, 211 Trade-winds, the, 122, 135 Universe, the, 22, 374 Uranus, his satellites, 34; distance from the sun, 64, 253
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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