Index 



653 



cylinder, 251, 260-261, 262-264, 586, 



588, 621, (587) 

 cytoplasm, 314, 491-492, 621, (314) 



Dalton, John, 22 

 dam, 48, 69, 76, 305, 621, (69, 305) 

 Darwin, Charles, 301, 564, 575 

 day, 119, 159 

 civil, 159, 620 

 solar, 159, 640 

 decay, prevention of, 445 

 decomposition, 301, 443, 621 

 degrees, 



of a circle, 157 

 of latitude, 120, 157 

 of longitude, 159 

 of temperature, 86-87, 123-124 

 dehumidifier, 598, 621 

 dendrites, 431 

 density, 172, 621 

 dentine, 400, (400) 

 deodorants, 462, 621 

 Department of Agriculture, 141 



519, 539 



dermis, 426, 622 

 desert, 48, 76, 133, 305 

 dew, 122, 127, 622 

 Dewar, J., 575 

 diabetes, 424 

 diaphragm, 173, 622 



of body, 37, 340-341, 342, 350, 



418, (342) 

 of camera, 188 

 of radio, 237 

 of telephone, 221-222 

 diastase, 496, 622 

 dicotyledon, 497, 505, 622 

 diet, 356, 362-366, 412, 451-452, 472, 



552, 622 

 diffusion, 



of body substances, 423, 424 

 of light, 185 

 digestion, 622 



animals and man, 312, 320, 322, 



328, 398-404, 405-408, 409-415 

 plants, 312, 493, 496 

 digestive system, 398-408, 622, 



(401) 



diphtheria, 347, 395, 448, 454, 457 

 459-461, 468, 563, 622, (460) 



dipping needle, 197, 200-201, 622 

 (200) 



direct current, 224, 622 



dirigible balloon, 279-280, 284, 605 



622, (280) 

 disease, 622 



causes of, 54, 58-59, 347, 360, 411, 

 451-454, 458-460, 466, 468, 471, 

 539, 541-544 

 germs of, 54, 58, 411, 448, 458, 



466, 541-544, 599, (460) 

 immunity from, 455-456, 628 

 protection against, 54-56, 58-60, 

 360, 417, 449, 451-464, 465-476, 

 552, 599, 601 



theories of, 453-454, 466 

 treatment of, 347, 422, 457, 458- 

 461, 467, 472, 474, 563, (461, 467, 

 472) 



disinfection, 449, 462, 475 

 dislocations, 481, 622 

 distillation, 92, 622 

 of petroleum, 91-92 

 of water, 61, (61) 

 doorbells, 217-218, (218) 

 draft, 105, 111, 112, 131, 260, 340, 



596 



drain, 53, 60, 359 

 drinking water, 48, 51, 53-57, 357, 



467 



drive rod, 264 



drive wheel, 18, 260-262, 266 

 dropsy, 421 

 drowning, 343 

 drugs, 374, 377-378, 382-391, 395, 436 



622 



dry cell, 209-210, 622, (210) 

 dry farming, 305, 622 

 dry ice, 597, 622 

 drying foods, 445, 447, 552 

 ductless glands, 423, 622 

 dye-producing plants, 531 

 dynamo, 18, 216, 223-224, 225, 234, 



235, 622, (224, 234) 

 dysentery, 58, 454 



ear, 170, 175-177, 485, 623 

 care of, 176-177 

 structure of, 175-176, (175) 

 tests of hearing, 177 



