612 



Index 



Atmosphere, 1 ff., 546 

 and altitude, 391 

 density of, 11, 42, 63, 392, 393 

 depth of, 12, 104, 391 ff. 

 electrification of, 38 

 exploration of, 391, 401 

 humidity of, 43 ff., 103, 306 

 pressure of, 10, 11, 15, 43, 390, 



391, 392 ff. 

 temperature of, 5, 10, 18, 84, 390 ff . 



Babbitt metal, 260 ff. 

 Bacillus, 217, 222, 576 

 Bacteria, aerobic, 216, 222, 574 



acid-producing, 568, 576, 585 



anaerobic, 216, 222, 574 



and decay, 213 ff., 221, 572, 578, 

 585 



and disease, 217 ff., 221 ff., 571 



classification of, 216, 573 ff. 



control of, 580 ff., 609 



cultivated, 572 



denitrifying, 473, 573 



distribution of, 570, 578 



forms of, 575 ff., 586 



in food, 579 



in water, 219, 221, 570, 579 



independent, 574 



industrial uses of, 568, 571, 572 



iron, 574 



nitrifying, 75, 471, 475, 572 ff., 585 



pathogenic, 217, 221 ff., 570, 582, 

 585 ff., 602 



putrefying, 215 ff., 570 



reproduction of, 576 ff . 



saprophytic, 573 



size of, 551, 577, 586 



soil, 75, 470 ff. 



sulfur, 574 



useful, 75, 567, 571 ff. 

 Balloon, 389 ff., 401 

 Barium salts, 176 

 Barograph, 16, 17 

 Barometer, aneroid, 89 



construction of, 13 



correction for altitude, 15 



kinds of, 15 ff. 



water, 15 



reading, 14, 15 

 Battery, 332 ff., 335 

 Bearings, friction-reducing, 260 ff . 

 Beaufort wind scale, 23 



Benzene, 164 



Benzine, 129, -314 



Bessemer converter, 442, 443, 451 



Bicycle, 261, 285 



Big Creek hydro-electric plant, 236, 

 240, 247, 249 



Biplane, 389 



Blast furnace, 437 ff., 451 



Blizzard, 31 



Body temperature, 87, 89 



Boiling, 303 ff., 306 



and pressure, 155, 299 ff. 

 temperature, 155, 299 ff. 



Bread, 559 ff. 



Brick, 419 ff. 



Bridges, 280 ff. 



British thermal unit (B. t. u.), 126, 

 142, 307 



Bubonic plague, 532 



Buds and budding, 498, 501, 503 



Building materials, 403 ff. 



Buoyancy, 338 ff., 345, 392 



Burbank, Luther, 481 ff. 



Burning point, see Kindling tempera- 

 ture 



Burning, see Combustion and Oxida- 

 tion 



Butter, 572 



Calcium carbonates, 135, 139, 417 

 Calms, belt of, 31 

 Calorie, 142 ff. 



gram, 142 

 Calyx, 484, 494 

 Camembert cheese, 553 

 Canals, 382 ff. 



in United States, 385, 388 

 Canning of foods, 580 ff. 

 Cantilever bridge, 283 ff. 

 Capillarity, 467, 474 

 Carbohydrates, 129, 139, 515, 516 

 Carbolic acid, 164, 583 

 Carbon, 81, 124, 128, 137, 168 ff., 175, 

 443, 515 



cycle, 136 



dioxid, 81, 124 ff., 156, 177, 411, 

 515, 546, 562 ff. 



monoxid, 126, 138, 163 

 Carbonated water, 134, 411 

 Carbonates, 135, 139, 411 ff., 433 

 Carborundum, 426 ff. 

 Carburetor, 331 



