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INDEX

(Numbers Denote Pages)

Acids, 191, 195

citric, 192
hydrochloric, 193
lactic, 192
nitric, 193
sulphuric, 193, 251
tartaric, 192

uric, 483
Action, involuntary, 501

reflex, 501

voluntary, 500
Adam's apple, 487
Adhesion, 124
Advantage from machines, 326
Air, 13, 32

compression of, 17
cooling of, 16, 17
heating of, 16, 17, 61
in motion, 170
in weathering, 169
moisture in, 57
Air brake, 19
Airplane, 346
Air pressure, 21, 24
Alcohol, 192, 220, 471, 491
Aldebaran, 100
Alfalfa, 396
Alloy, 181
Alluvial soil, 172
Aluminum bronze, 182
Amber, 243
Ameba, 450
Ammonia, liquid, 144
Ammonium chloride, 254
An 62
Anemia, 210
Animals, 422, 423
Anthracite, 186

Ants, 441
Aorta, 479
Arbor day, 415
Arc light, 270
Armature, 234, 263, 265, 272
Arteries, 477, 479, 480
Artesian wells, 154
Ashes, 29
Assimilation, 474
Atmosphere, 21, 77, 163

composition of, 78
Automobile, 358
Axe, 326
Axil of leaf, 374
Backbone, 499
Backlog, 62
Bacteria, 41, 222, 223, 381, 415,

490
Baking, 214, 217
Baking Powder, 218
Balance, sense of, 318
Baling press, 339
Ballast, 117
Bamboo, 389, 393
Banana, 402
Barley, 390
Barometer, 23
Bases, 194
Bathing, 493
Battery, 255

storage, 256
Beasts of burden, 425
Bedrock, 163
Bees, 440
Bell, electric, 262
Berries, 401

Biceps, 334, 459

Cabbage, purple, 195
Caisson, 19
Calcium, 210

carbonate, 48

phosphate, 138
Callus, 492
Calorie, 72
Camera, photographic, 288

pinhole, 287
Camphor, 413
Canals, 174
Candle, 30, 38, 301

power, 284

Big trees, 404
Bird houses, 437
Birds, 379, 431

lungs, 488
Bituminous coal, 186
Blackberry, 402
Bladder, 483
Blast furnace, 180
Bleeding, 476, 480
Blood, 474

pressure, 25

vessels, 477
Blotter, 125
Blubber, 301
Blushing, 501
Boat, sail, 343

submarine, 19, 281
Body heat, 73

temperature, 53
Boiling, of food, 216

of water, 143

point, 69
Boll weevil, 441
Bones, 452, 458
Botany, 366
Brain, 496
Branches, 406
Brass, 182
Bread, 393
Breathing, 49, 52, 58, 485
Brick, 186
Brimstone, 136
British thermal unit, 72
Broiling, 217
Bronchial tubes, 487
Bronze, 182
Buds, 375
Buffalo, 382
Bulb, of brain, 498

electric, 269

incandescent, 269
Bunsen burner, 303
Burner, Bunsen, 303
Burning, 48

experiments with, 29
explanation of, 32
glass, 286

Candling of eggs, 433
Canning, methods of, 224, 225

factory, 227
Capillaries, 477, 479, 481
Capillary action, 125
Carat, 183
Carbohydrate, 207, 372
Carbon, 39, 42

burning of, 43
Carbon dioxide, 42, 44, 78, 192,

220, 372.
Carburetor, 359
Care of body, 461
Cartilage, 454
Cartridge, 356
Cassiopeia, 100
Cast iron, 181
Cat, 436, 456
"Caterpillar”, 361
Caterpillars, 439
Cell, dry, 254

simple electric, 251
Cells, living, 365, 370, 422, 450,

472
Cellulose, 414
Centerboard, 345
Center of gravity, 118
Centigrade, 69
Central nervous system, 500
Centrifugal force, 122, 353
Cerebellum, 498
Cerebrum, 498
Chaff, 388
Charcoal, 42

Charge, electric, 245

negative and positive, 247
Charring, 42
Chemical change, 128

energy, 294, 372
power of light, 272
Chickens, 432
Chills, 493
Chlorine, 136
Chlorophyll, 371
Chrysalis, 439, 440
Chyle, 470
Chyme, 469
Cilia, 486
Cirrus cloud, 81
Citrous fruits, 402
Clay, 72
Cleaning, 198
Climate, 77, 147
Climbing plants, 373
Clothing, materials, 198

tight, 491
Clouds, 79, 81
Clover, 396
Coagulation, 477
Coal, 184, 271
Cocoon, 440
Cohesion, 124
Coke, 43
Cold frame, 293, 372
Colds, 491
Collecting air, 14
Color, 292
Columbus, 4
Combustion, 33

spontaneous, 40
Comets, 109
Community life, 509
Compass, mariner's, 234

needle, 235

pocket, 233
Compound, 130
Compressed air, 18
Compression pump, 18
Concrete, 187
Conduction of heat, 63
Conductor, 257, 268
Conduits, 257

Cone-bearing plants, 382
Connective tissue, 431, 453, 459,

487, 492
Constellation, 98, 99
Convection, 64
Cooking, 214
Copper, 182

alloys, 182

sulphide, 137
Core of earth, 163
Cork, 413
Corn, 388, 390
Corpuscles, 452, 475, 482
Cotton, 199, 399

gin, 399
Cottonseed oil, 399
Cotyledons, 368, 408
Cows, 428
Crane, 62, 261, 336
Cream separator, 352
Creosote, 223
Crops, 174, 176
Crossbreeding, 419
Cross section of tree, 407
Crowbar, 326
Crust of earth, 163
Crystalline lens, 287, 294
Cultivating, 173
Currents, electric, 249
Cyclone, 86
Dairying, 175
Damper, 62
Dandelions, 417
Day, 95
Decay, 40, 41, 49
Deciduous, 413
Declination of compass,

240
Degree of heat, 71
Density, 115
Dermis, 431, 492
Derrick, 336
Developing, 289
Dew and dew point, 78
Diamond, 184
Diaphragm, 457
Dietetics, 471
Digestion, 214, 463

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Dipper, 98
Discharge, electric, 246
Distances of stars, 100
Distillation, 159
Diving bell, 19
Dog, 425
Domestic animals, 423
Drops of liquid, 124
Dry cell, 254
Dry cleaning, 204
Drying food, 222
Dust, 78
Dynamo, 250, 271, 272, 323, 350
Ear, 315
Earth, 95, 105

shine, 109
Earthworm, 485
Echo, 318
Eclipse, 4, 282, 283
Egg, 117, 379
Electric bell, 262

bulb, 269
charges, 245
currents, 249
flatiron, 267
magic, 243
meter, 306
motor, 274
power, 271
telegraph, 264

washer, 355
Electricity, 4, 244
Electrolysis, 129
Electromagnet, 260, 272
Electroplating, 266
Element, 130
Emulsion, 202, 442, 470
Enemies of trees, 414
Energy, 112, 121, 206, 256, 271,

274, 325
chemical, 294
muscular, 245

of plants, 366
Engine, gasoline, 360

steam, 357
Epidermis, 431, 492

of leaf, 370

Epiglottis, 487
Erosion, 167
Esophagus, 467, 487
Evaporation, 144
Evergreens, 413
Excretion, 483
Exercise, 491
Experiment, 6
Eye, 294

glasses, 287
Fabrics, 398
Fahrenheit, 68
Faraday, 272
Far sight, 296
Fats, 208, 399
Fatty tissue, 431
Faucets, 155
Feather, 431
Fermentation, 191
Ferments, 464, 468
Ferns, 382
Fertility of soil, 175
Fertilization, 379
Fertilizers, 176
Fibrin, 477
Field, magnetic, 238, 262
Film, photographic, 287, 289
Filter, 159
Fire, 26, 27, 28

engine, 47
Fireless cooker, 76
Fireplaces, 61
Fishes, 437
Fixed stars, 99
Flame, 28, 33
Flashlight, 254
Flatiron, electric, 267
Flax, 199, 399
Flint and steel, 27
Flowers, 377
Fly, 443

trap, 443
Focus, 286, 289
Fog, 80, 357
Food, 206, 214

of plants, 366
preserving of, 222

Grate, 62
Gravel, 172
Gravitation and gravity, 113
Great Bear, 99
Gross weight, 15
Ground glass, 20
Growth, 206

substances, 398

Force, 112, 120,

centrifugal, 353

in water surface, 123
Forearm, 334
Fore stick, 62
Fossils, 165, 243, 422
Frame, cold, 293, 372
Franklin, Benjan, 4, 5
Freckles, 492
Freezing point, 69
Friction, 121, 339
Frost, 78
Fruit, 401
Frying, 217
Fuel, 134
Fulcrum, 331
Fungi, 381
Furnaces, 64, 65, 66
Fuse box, 303

plug, 304

Gale, 85
Galileo, 22, 68
Galvani, 251
Gases, expanding, 356
Gas stove, 303

meter, 304

natural, 302
Gasoline, 204, 302

engine, 360
Gastric juice, 468
German silver, 182
Germination, 368
Germs, 300, 490
Gills, 485
Glaciers, 171
Glands, 463

sweat, 492
Glass, 300

burning, 286
Gluten, 209, 394
Glycerine, 204
Gold, 182
Graham flour, 394
Grand Cañon, 149
Granite, 167, 186
Grape juice, 192
Grass, 387

Habits, 503
Hail, 81
Hair, 492
Hammer, pneumatic, 19
Hard water, 160
Hardwood, 412
Hearing, 315, 499
Heart, 477

wood, 409
Heat, 28, 71

from electricity, 267
capacity, 147
Heating, 61
Heavenly bodies, 95
Hematite, 179
Hemoglobin, 475
Hemorrhage, 25
Hemp, 399, 400
Horizon, 97
Horse, 425, 426
Howe, Elias, 352
Human body, 449
Hurricane, 85, 87
Hydrochloric acid, 45
Hydrogen, 129, 252

burning of, 133
in fuels, 134
preparation of, 130
properties of, 132
Hydrogen peroxide, 37
Hydroplane, 348

Ice, 144, 170

cream, 145

sheets, 171
Illuminated bodies, 277
Inclined plane, 327, 347
Incubator, 433
Indirect lighting, 309

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