Ants, 441 Arbor day, 415 Armature, 234, 263, 265, 272 Arteries, 477, 479, 480 Ashes, 29 Assimilation, 474 Atmosphere, 21, 77, 163 composition of, 78 Automobile, 358 Axe, 326 Axil of leaf, 374 490 Baking, 214, 217 Baking Powder, 218 Balance, sense of, 318 Bamboo, 389, 393 Banana, 402 Barley, 390 Bases, 194 Bathing, 493 Battery, 255 storage, 256 Beasts of burden, 425 Bedrock, 163 Bees, 440 Bell, electric, 262 Berries, 401 Biceps, 334, 459 gin, 399 Cottonseed oil, 399 Crane, 62, 261, 336 Crops, 174, 176 Cross section of tree, 407 Currents, electric, 249 Cyclone, 86 Dairying, 175 Decay, 40, 41, 49 Declination of compass, 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, 463 240 bulb, 269 charges, 245 currents, 249 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 Epiglottis, 487 Erosion, 167 Esophagus, 467, 487 Evaporation, 144 Evergreens, 413 Fabrics, 398 Fermentation, 191 Ferments, 464, 468 Ferns, 382 Fertility of soil, 175 Field, magnetic, 238, 262 Fire, 26, 27, 28 engine, 47 Fireless cooker, 76 Fishes, 437 Fixed stars, 99 Flatiron, electric, 267 Flowers, 377 Fly, 443 trap, 443 Focus, 286, 289 Fog, 80, 357 of plants, 366 preserving of, 222 Hammer, pneumatic, 19 Hard water, 160 Hardwood, 412 Hearing, 315, 499 Heart, 477 wood, 409 Heat, 28, 71 from electricity, 267 Heating, 61 Heavenly bodies, 95 preparation of, 130 Hydrogen peroxide, 37 Hydroplane, 348 Ice, 144, 170 |