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Ocean, density of the, 51,
60; of the Pacific, 88;
tides, 108

Optics, 172, 179, 210, 223

Orinoco, cataracts of the,

147

Precession and nutation,
93, 95

Probabilities, the theory of,
71

Problem of the three bodies,
69

Otaheite, observations by Proportion, law of definite,

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

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129

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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

THE END.

R-

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