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Undulation. A wave.

Undulatory theory. The mechanical principles of the motion of waves.

Vapour. Steam.

Variation. A periodic inequality in the motion of the moon.

Variation of the compass. The deviation of the

compass needle from the true north.

Vertical. The direction of the plumb-line.

Vertical plane. A plane passing through the plumbline, consequently at right angles to the horizon. Vesicles. Small hollow spheres of water.

Vibration. A motion to and fro.

Visual ray. A ray of light coming from any object to the eye.

Volta-electric induction. The disposition of elec

tric currents to produce similar currents in bodies near them capable of receiving them.

INDEX.

ABERRATION of light, 31

Acceleration of the moon,
39

Action, compound and dis-
turbed, of the spheres, 12
Air, elasticity of, 90
Airy, Professor, 218, 225
Algæ, 279

Algol, the star, 388

Alps, the, 273

Amazons, river of the, 117

Andes, the, 134

Arabian science, 108

Arago, M., 135, 219, 266, 341
Arcs of the meridian, mea-
surement of, 54, 56
Asia, north-west basin of,
133
Astronomy, physical, 1; di-
visions of the science of,
68, 96

Astronomical tables, 68
Atmosphere, the, 123, 129,
130, 137, 163, 296
Attraction, its power uni-
versal, 1

and repulsion, elec-

trical, 291, 354

capillary, 123, 125

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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 phenome-
na, 172, 188; refraction
and polarization of light
by, 203, 216; imperme-
able 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

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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 articula-
tions imitated by instru-
ments, 162; primitive
tongues, 284

La Place, 22, 37, 73, 101,
103, 115, 135

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

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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

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