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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

Magnet, the, 309-339

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

of

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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,

62

-, new, 45

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

seq.

Occultation of stars, 46

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

Optics, 172, 179, 210, 223
Orinoco, cataracts of the,

147

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

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Precession and nutation,

93, 95

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

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

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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.

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