INDEX.
[The numbers refer to the paragraphs]
Action and reaction equal, 182
Air, compressibility of, 152
Air, elasticity of, 161
Air, density of, dependent on pressure, 158
Air, pressure of, as affecting the boiling point, 171, 327
Air, currents in, from heat, 281
Air, solution of water in, 287
Air attracted by the earth, 148
Air in interstices of substances, 160
Air a non-conductor of heat, 302, 304
Air-pump, 155
Air-guns, 164
Animals, coverings suited to climate, 305
Archimedes, his lever, 229
Archimedes, his discovery in the bath, 138
Archimedes and the crown, 143
Artesian wells, 120
Aqueducts, 119
Atmosphere, pressure of, 154, 168
Atmosphere, how it moves with the earth, 188
Atomic theory, 15
Attraction, nature of, 53
Attraction, capillary, 72
Attraction between masses, 73
Attraction between solids and liquids, 69
Attraction, Newton's idea of, 54
Attraction, universality of, 77
Attraction, variety in results of, 87
Attraction, opposition between modes of, 88
Attraction, proportion of the mutual motions of, 76
Balloon, hydrostatic, 159
Barometer, 169
Barker's mill, 182
Battery, electrical, 387
Berkeley, his ideas of matter, 2
Boats, why they float, 139
Boiling point as affected by the pressure of the air, 171
Brittleness, 29
Buds in winter, 308
Bulk, relation of, to resistance of liquids and gases, 193
Camera obscura, 352
Canals, 117
Cartesian image, 159
Centre of gravity defined, 96
Centre of gravity, support of, in animals, 106
Centre of gravity, movements of, in walking, 107
Centre of gravity in relation to attitudes, 108
Centre of gravity in floating bodies, 145
Centrifugal force, 213
Centripetal force, 213
Chimneys, draught of, 282
Clothing, object of, 306
Clouds, how formed, 288
Clouds, colors of, 364
Clouds, shapes of, 289
Clouds, latent heat in, 324
Cocoons, constructed for winter, 307
Colors of objects, 363
Colors of the clouds, 364
Cohesion, strength of, 68
Cohesion, what is essential to it, 66
Cold, absence of heat, 270
Cold at great heights, cause of, 322
Cold from evaporation, 326
Compressibility of substances, 35
Compressibility of air, 152
Condenser, 162
Conductors of heat, 298
Conductors of electricity, 375
Conduction of heat, 297
Conduction, relation of density to, 300
Conduction in liquids, 301
Conduction, influence of, on sensation, 310
Convection of heat, 296
Coverings of animals suited to climate, 305
Crystallization, 62
Daguerreotype, 369
Dams, 122
Davy's safety-lamp, 299
Dawn explained, 346
Density, 24
Dew, formation of, 315
Dew-drops, colors in, 367
Dew-point, 317
Diatonic scale, 267
Draught of chimneys, 282
Drowning, how it can often be prevented, 141
Earth, globular form of, 61
Earth, roundness of, shown, 113
Earth, attraction toward centre of, 80
Earth, thickness of its air-covering, 150
Earth, shape of, influenced by centrifugal force, 218
Earth, rotation of, affecting winds, 284
Elasticity, 39
Elasticity, definition of, 42
Electricity, origin of the term, 370
Electricity, attraction and repulsion in, 371
Electricity, vitreous and resinous, 372
Electricity, galvanic, 394
Electricity, universality of, 378
Electricity, discharge of, from points, 383
Electricity, sound of, 389
Electricity, heat produced by, 391
Electricity, mechanical injuries by, 390
Electrics and non-electrics, 377
Electrical battery, 387
Electro-magnetism, 413
Electro-magnets, 414
Electric telegraph, 415
Equestrian feat, 185
Equilibrium, stable and unstable, 109
Evaporation, 286
Evaporation, cold produced by, 326
Expansion by heat, 274
Expansion, exception to it, 330, 331
Extension, a property of matter, 44
Eye, description of, 353
Eye, images in, inverted, 356
Feathers, how a non-conductor of heat, 305
Fire-engine, 179
Flexibility, 29
Flies, feet of, 157
Force, relation of, to velocity, 194
Forcing-pumps, 178
Franklin, his theory of electricity, 373
Franklin, his discovery, 392
Freezing, process of, described, 330
Freezing point, why at 32°, 332
Freezing in the midst of boiling, 327
Freezing mercury, 318
Freezing mixtures, 325
Friction, 196-198
Friction in machinery, 245
Frost, 44
Fur, how a non-conductor of heat, 305
Fur, how altered by climate, 305
Fusee of a watch, 238
Galvanism, 394
Gases, movements of the particles in, 10
Gases, space in, 21
Gases, compressibility of, 38
Gasometer, 163
Glass, annealing of, 32
Glass-making, centrifugal force used in, 216
Governor, steam, 217
Gravitation, limiting size, 90
Gravitation, action of, on solids in a liquid, 136
Gravity, specific, defined, 135
Gridiron pendulum, 210
Gunnery, retardation by condensed air in, 166
Hail, how produced, 290
Hardness, 28
Harmony, 266
Hearing, mysteries of, 269
Hearing, trumpet, 262
Heat, nature of, 271
Heat, sources of, 272
Heat, relations of, to forms of matter, 13
Heat, relation of, to bulk of liquids, 37
Heat, relation of, to light, 273
Heat producing expansion, 274, 275, 279
Heat, communication of, 295
Heat, convection of, 296
Heat, conduction of, 297
Heat, radiation of, 311
Heat, reflection of, 314
Heat, connection of, with light, 312
Heat, production of, by electricity, 391
Heat, degree of, endurable by man, 328
Heat, latent, 319
Heat, capacity of different substances for, 320
Heat, relation of, to density, 321
Heat, relation of, to forms of substances, 323
Heat and cold, 270
Heights measured by barometer, 170
Hume, his ideas of matter, 3
Hydrometer, 144
Hydrostatics, what it teaches, 110
Hydrostatic balloon, 159
Hydrostatic bellows, 132
Hydrostatic paradox, 131
Hydrostatic press, 133
Ice, formation of, 329
Ice, force of its expansion, 333
Ice-crystals, colors in, 367
Icebergs, centre of gravity in, 145
Impenetrability, 45
Imponderable agents, 16
Inclined plane, 241
Induction in electricity, 379
Induction in magnetism, 400
Inertia, 48
Inertia shown in the communication of motion, 183
Inertia shown in disposition of motion to continue, 184
Insulating stool, 382
Jupiter, mountains in, 92
Kaleidoscope, 343
Laggan stones, 100
Land-breeze, 283
Lenses, 349
Lever of first kind, 224
Lever, no gain of power in it, 227
Lever of second kind, 231
Lever of third kind, 232
Life-boats, 139
Light, nature of, 334
Light, sources of, 335
Light, diffusion of, 337
Light, velocity of, 338
Light, reflection of, 340
Light, refraction of, 345
Light moves in straight lines, 336
Light shown to be compound, 360
Light, colors in, 360
Light, recomposition of, 362
Light, chemistry of, 369
Lightning-rods, 393
Liquids, movability of their particles, 9, 57
Liquids, incompressibility of, 36
Liquids, attraction in, 56
Liquids, globular shape of drops of, 58
Liquids, cause of level surface of, 111
Liquids, pressure of, in proportion to depth, 121
Liquids, lateral pressure of, 123
Liquids, pressure of, equal in all directions, 125
Liquids, upward pressure as depth, 127
Liquids, in what like gases, 153
Liquids, friction of, in tubes, 197
Liquids, friction of, in streams, 198
Liquids, expansion of, by heat, 275
Loadstones, 397
Machines not sources of power, 222
Machinery, friction in, 245
Magic lantern, 351
Magdeburg hemispheres, 156
Magnetism, origin of term, 397
Magnetism, attraction of, 398
Magnetism, repulsion of, 401
Magnet, poles of, 399
Magnets, artificial, 403
Magnets, horseshoe, 404
Magnetic needle, 405
Malleability, 28
Man a tool-making animal, 247
Mariner's compass, 405
Matter distinguished from spirit, 1
Matter, effects of, on senses, 6
Matter, forms of, 7
Matter, nature of, 14
Matter, constitution of, 14
Matter, variety in properties of, 17
Matter, divisibility of, 18, 51
Matter, minute division of, 19
Matter, pores and spaces in, 22
Matter, relation of heat to spaces of, 23
Matter, inertia of, 48
Matter, impenetrability of, 45
Matter equally inclined to rest and motion, 50
Mechanical powers, real advantages of, 246
Mercury, freezing of, 318
Microscopes, 350
Microscopical animals, 19
Mirages, 347
Mirrors, 342
Mirrors, curved, 344
Moth's wing, 19
Motion, causes of, 181
Motion, universality of, 180
Motion, absolute and relative, 191
Motion, obstacles to, 192
Motion, reflection of, 206
Motion, compound, 212
Motion, curved, 213
Motion in orbits, 221
Motion disposed to be straight, 211
Motion, that of falling bodies projectile, 220
Motion and rest, 189
Momentum, 201
Mountains, size limited, 92
Nature, order in, 65
Near-sightedness, 355
Needle, magnetic, 399
Needle, declination of, 406
Needle, dip of, 407
Noise, how it differs from musical sound, 263
Non-conductors of heat, 298
Non-conductors of electricity, 375
Notes, musical, how produced, 264
Odors, minuteness of their particles, 19
Order in nature, 65
Papin's digester, 292
Pendulum, 208-210
Perpetual motion attempted, 118
Persia, accident to, 274
Pisa, tower of, 104
Pitchers, why they have lips, 89
Pneumatics, what it teaches, 146
Pneumatic trough, 167
Pop-guns, 164
Pottery, centrifugal force used in, 216
Powder, explosive force of, 165
Prince Rupert's drops, 33
Pulleys, 239
Pumps, 176
Pumps, forcing, 178
Radiation of heat, 311
Radiation, its relation to absorption, 313
Rain, how it is caused, 290
Rarity, 24
Reaction equal to action, 182
Reflection of heat, 314
Reflection of light, 340
Reflection of motion, 206
Reflection of sound, 260
Remora, 157
Rest, merely relative, 189
Rivers, bends in, 215
Roemer, observations of, in regard to the velocity of light, 339
Rope-dancers, skill of, in managing centre of gravity, 109
Safety-lamp, 299
Screw, 243
Sea-breeze, 283
See-saw, a lever, 228
Sensation, influence of the conduction of heat on, 310
Shape, relation of, to velocity, 195
Shot, manufacture of, 60
Signal key, 415
Silk-worm, thread of, 19
Size limited by gravity, 90
Sluice-gates, 122
Snow, how produced, 290
Snow, crystals of, 64
Snow a protection to plants, 309
Solids, constitution of, 8
Solids, attraction in, 39
Sound, what it is, 248
Sound, sensation of, how produced, 252
Sound, velocity of, 256
Sound, transmission of, 253
Sound, loudness of, 258
Sound, diffusion of, 259
Sound, reflection of, 260
Sound, concentration of, 262
Sound, none produced by the heavenly bodies, 255
Speaking-trumpet, 262
Specific gravity defined, 135
Specific gravity of animals, 140
Specific gravity of the human body, 141