Aberration of light, 69, 149, 218
Absorption, 104-6
Acceleration, 239
Actinic rays, 141
Action at a distance, 96, 174, 176
and re-action, 20, 251
Adams' discovery of Neptune, 25
Aether is matter, 54-8
is atomic, 59-67
is gravitative, 64-9
density of, 69, 71, 136, 243
elasticity of, 74-7
inertia of, 76, 330
its motions, 80
compressibility of, 291, 315
waves, 79-80
Aetherial basis of matter, 326
Affinity, chemical, 43
Aldebaran, 312
Aluminium, 79
AmpÈre, 192
AmpÈre's theory of magnetism, 193
Andromeda, 314
Annual magnetic variation, 208
Annular nebulae, 320
Aphelion of earth, 36
Arago, M., 321
Arcturus, 312
Areas, Kepler's law of, 36
Asten, Von, 234, 296
Asteroids, 31
Atmosphere, 68, 73, 102, 225
Atom, vortex, 45, 46, 61
what it is, 43
electron, 63
Boscovitch, 61
hard, 61
size of, 43
Attraction, electrical, 2, 286
of gravitation, 13, 24, 31
magnetic, 195
Balance, Torsion, 187
Bernoulli, 221, 341
Beta Persei, 308
Biela's comet, 296-7
Binary compound, 143
stars, 25, 309
Biot, 138
Boscovitch atoms, 44, 138
Boyle and Marriotte's law, 76, 103
Bradley's discovery of aberration, 149
Bredichin on comets' tails, 302
Brilliancy of stars, 307, 309
British Association Report, 57, 59
Calcium, 79
Canis major, 307
minor, 307
Capella, 312
Carbon, 48
Carboniferous period, 115
Carnot on heat, 116-18
Cassini, 307
Cause and effect, 14
of gravitation, 1, 282-9
Cavendish experiment, 24
Centauri, 79
Centre of gravity, 325
Centrifugal force, 9, 13, 15, 30, 236-8
Centripetal force, 9, 12, 282
Cetus, 307
Chalk, 6
Challis, Prof., 74, 96, 100, 107, 151, 155, 214, 227, 311
Chemistry, 47, 336
Coal, 86, 88
Clairaut, 297
Clusters of stars, 314
Cohesion, 48
Colour, 138
Colours of stars, 308
seven primary, 139
Comets, 291
attracted by planets, 298
condensation of, 292
Comets and meteors, 297
short period, 293-4
long period, 293-4
tails of, 298-9
orbits of, 293
nucleus of, 298-9
coma, 298-9
Compressibility of aether, 291, 315
Condensation of gases, 47
Conservation of matter, 42
of energy, 84
of motion, 92
Constellations, 307
Corollary, 15
Corona Borealis, 309
Corpuscles, 42, 64, 136
Corpuscular theory of light, 122
Correlation of forces, 83
Coulomb Torsion balance, 185, 187
Crookes, Sir William, 42, 136, 326, 341
Current, electric, 163
magnetic, 192
Currents, 90
Curry, Prof., 284
Cycle of operations, 114, 116
Cygnus, 307
Dalton's atomic theory, 42
Davy, 99, 107
Day and night, 4
D'Arrest's comet, 296
Deimos, 38
Democritus, 44
Density of matter, 51
of aether, 69
electric, 170
of earth, 242
of sun, 27
of planets, 242
Descartes, 221-2, 341
Dewar, Prof., 47
Diameter of earth, 29
polar, 29
equatorial, 29
of sun, 280
of planets, 29
Dielectric, 168, 175
Diffusion, 49
Dip, magnetic, 199
Distances of stars, 280
Diurnal variations, magnetic, 209
Dog star (Sirius), 306
Donati's comet, 298
Double stars, 308
Draco, 307
Dynamical equivalent of heat, 114
value of light, 150
Dynamics, laws of thermo-, 114-18
Dynamo, 87, 90
Ear, 120
Earth, mass of, 235, 242
a magnet, 196-8
size of, 29
rotation of, 219
orbit of, 276
periodic time of, 251
gravity of, 29
shape of, 29
distance from sun, 242, 251
velocity in orbit, 251
Eccentricity of orbits, 268, 276
Eclipse, 145, 148
Ecliptic, plane of, 277-9
Elasticity, 46
of matter, 51
of aether, 74
Electric current, 154
potential, 170
induction, 175
radiation, 182
density, 170
energy, 179
field, 166, 179
lines of force, 173
Electricity, 64, 162
two kinds of, 175
positive, 175
negative, 175
laws of, 184
theories of, 162
Electrons, 136, 163
Electro-static, 158, 164
kinetic, 158, 164
kinetic energy, 217
magnetism, 192-5
magnets, 199
magnetic theory of light, 229
chemical equivalents, 189, 333
Elements of matter, 47
Ellipse, 34
Kepler's discovery of, 34
Elliptical nebulae, 320
Emission theory of light, 122
Encke's comet, 293, 296
resisting medium, 228
Energy, 83, 84
what it is, 83
conservation of, 84
transformation of, 86
potential, 87
kinetic, 89, 164
radiant, 109
electrical, 179
and motion, 91
Engine, Carnot's heat, 116
Envelopes of comets, 298
Epicureans, 44
Equal areas, 36
times, 36
Equator, N. and S. Poles, 29
magnetic, 202
terrestrial, 29
Equipotential surfaces, 171
Equivalents, electro-chemical, 189, 333
Euler, 123
Exchanges, theory of, 105
Experience, 4
Experiments of Rumford, 98
of Michelson and Morley, 67, 227
of Lebedew, 302
of Nichols and Hull, 153
of Hertz, 165
of Faraday, 65, 285
of M. Faye, 302
of Joule, 114
Falling stone, 21, 29
Faraday, 45, 175, 220
on matter, 56
on Lines of Force, 168, 43
Laplace, 317
nebular hypothesis, 317
Larmor, Dr., 22, 44, 56,
63, 93, 163
on electrons, 284
on aetherial physics, 22, 327-9
Lavoisier, 42
Law of gravitation, 24
of inverse squares, 27
Laws of electricity, 184
of light, 145
of heat, 113
of motion, 9, 15, 233
Lead, 88, 333
Lebedew, 32, 76, 153
Le Verrier, 25
discovery of Neptune, 25
Leyden jar, 157
Liebnitz, 223
Light, 75
a mode of motion, 122
corpuscular theory of, 123
undulatory theory of, 123, 136
electro-magnetic theory of, 156
path of a ray of, 144
intensity of, 145
reflection of, 136
refraction of, 135
aberration of, 149
composition of, 139
velocity of, 148
zodiacal, 277
transverse vibration of, 130
Lines of force, electric, 173
magnetic, 201-3
Liquefaction of gases, 47
Liquid air, 47
Liquids, 48
Little Bear, 307
Dog, 307
Lockyer, 109
Lodge, Dr., 219
on aether density, 69
on aether, 284, 289, 328, 332
on electric inertia, 330
on electricity, 64, 69, 284, 285
on force, 17
on gravitation, 283
Lorentz on light, 154
Lyra, 307
MacLaurin, 2, 10, 17
Magnesium, 79
Magnet, 21
Magnets, bar, 199
moving, 211
Magnetic axis, 202
field, 199
lines of force, 200
shells, 205
equator, 202
induction, 199
variation, 208
molecules of, 193
polarity, 194
Magnetism of earth, 207-12
of planets, 211
cause of solar, 211
AmpÈre's theory of, 193
Mars, 68, 79
a magnet, 196
rotation of, 219
size of, 236
orbital velocity of, 251
satellites of, 178
orbit of, 33
Mass, 27, 53, 187
of earth, 235, 242
of planets, 235, 242
of sun, 190
Matter, elements of, 40
properties of, 42, 50
and motion, 41, 322
conservation of, 42
divisibility of, 44
four states of, 48
aetherial basis of, 48, 333
physical constitution of, 334
Maxwell, J. C., 43, 73, 85, 151, 211
on physical lines of force, 168, 203-5, 288
on aether, 59, 206
on magnetism, 205
on electro-kinetic energy, 180, 217
on aether, 58
Mayer, 84, 86, 114, 118
McCullagh, 75
Mechanical energy, 87
Medium, Descartes on a, 221
Kepler on a, 222
Mercury, 68, 79
a magnet, 196
rotation of, 219
eccentricity of orbit, 33
mass of, 242
orbital velocity of, 251
Meteorites, 95, 118
Meteors, 31, 85, 118
Michelson and Morley, 7, 67
Milky way, 79, 309, 314
Molecules, 44
Momentum, 20
Moon, 61
Motion of stars, 310
planetary, 253
of sun, 274
of aether, 80
and work, 95
modes of, 92, 122, 163
first law of, 15, 16, 239
second law of, 19, 244
third law of, 20, 251
Multiple stars, 308
Natural philosophy, 4
Nebulae and aether, 313
structure of, 314
spiral, 322
annular, 320
elliptical, 320
planetary, 321
spectrum of, 314
irregular, 319
Nebular hypothesis, 317
Nebulous stars, 311
Neptune, 68
discovery of, 25
mass of, 235
orbital velocity of, 251, 265
distance from sun, 242
a magnet, 196
Newton's coloured rings, 107
Optics, 72, 98, 122
letter to Bentley, 2, 96
Rules of Philosophy, 3
Principia, 3, 7, 38
emission theory, 123
law of gravitation, 24
atoms, 44
on aether, 98
Nichols and Hull, 32, 153
Ocean, 81, 90
Operations, cycle of, 114
Optics, Newton's, 2, 122
Orbital motions of planets, 266
Orbit of earth, 33
of Venus, 33
Orbits of satellites, 34
of planets, 33-4, 266
moon, 267
stars, 310
sun, 270
Origin of sun's heat, 95
Orion, 79, 307, 314, 319
Oxygen, 40, 44, 60, 93
Parallelogram of forces, 15
Pendulum, 88
Periodic times, 37
Perpetual motion, 93, 220
Phil. Mag., 58, 67, 71, 73, 74, 80
Phil. Trans., 58, 62, 64, 75
Philosophy, Rules of, 3
Phobos, 38
Physical lines of force, 203-6
Pitch of Sound, 105, 120, 139
Plane of ecliptic, 277-9
Planetoids, 31
Planets, minor, 31
origin of, 240
orbits of, 33, 266
electrified bodies, 177
masses of, 242
relative distances of, 242
orbital velocities of, 251
periodic times of, 251
Platinum, 48
Pleiades, 79
Polarization, 176
Potential energy, 87
Potential, electric, 170
magnetic, 194
Pouillet, M., 109
Poynting, 91
Pressure, aetherial, 181
Preston, Prof., 283
Prevost, theory of exchanges, 105
Primitive impulse, 9, 10, 12, 319
Principia, Newton's, 3, 7, 38-9, 122
Properties of matter, 42
Quantity of sun's heat, 109
Query, 18-19
Optics, 72, 122
Radiant heat, 109
energy, 115
Radiation, 104
Radius Vector, 26
Rankine, 103
Rays, actinic, 141
dark heat, 140
infra-red, 141
ultra-violet, 140
Rontgen, 341
X, 341
Rectilinear propagation of light, 144
of heat, 111
Reflection, 160
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of sound, 123
Vibratory motion, 91
Vogel, Prof., 308, 312
Vogt, Prof., 332
Volume of sun, 27
Von Asten, 234, 296
Vortex theory, 92, 337
motion, 221-4
atom, 93, 126, 337
rings, 125, 337
Vortices, molecular, 103
Water waves, 124
currents, power of, 95
composition of, 141
power, 88
Wave front, 128
motion, 124, 160
Wave lengths, 120
envelope, 112
Waves, chemical, 141
sound, 104, 120, 124
light, 126
heat, 141
electric, 159
spherical, 112
electro-magnetic, 165
Weight, 29, 69, 84
variation of, 29
pound, 30
Whewell, 3, 221
Winds, 81, 90
energy of, 90
trade, 225
Work, 96
and energy, 84
from heat, 116
Young, Thomas, 54, 64, 67, 123
on aether, 58
fourth hypothesis, 70
Prof., of America, on electric space, 166
Zinc, 88
Zodiacal light, 277-9
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