Index 



655 



elevation and air pressure, 39 

 ellipse, 150-152, 623 

 elodea, 492, 535, 623, (492) 

 embryo, 494, 504-508, 623, (504) 

 emergencies, 478-486, 623 

 emetic, 485, 623 

 emulsion, 62, 406, 623 

 endosperm, 504-505, 624, (504, 



507) 

 energy, 12, 16-21, 235, 624 



and food, 19, 339-340, 35^1-355, 



358, 361, 362, 372, 512 

 chemical, 208, 211 

 conservation of, 16, 18, 20, 252- 



253, 340, 621 

 denned, 12, 16, 75, 243 

 electric, 16, 18, 67, 68, 74, 203, 



208, 209, 224 

 forms of, 16-17, 67, 195 

 kinetic, 17, 18, 629 

 latent, 17, 18, 630 

 mechanical, 223, 631 

 of heat, 18-19, 35, 68, 81, 83, 101, 



119, 251, 361 

 of light, 67, 180 

 of machines, 252 

 of motion, 16-18, 67, 119, 131, 



170, 224 



of water, 18-19, 67-68, 75 

 potential, 17, 18, 50, 632 

 radiant, 102, 151, 180, 234, 572, 



637 



sources of, 19, 67-68, 74-75, 224 

 sun as source of, 19, 68, 81, 83, 

 102, 119, 131-132, 151, 180-181, 

 224, 491 



transformation of, 17-19, 67-68, 

 74-75, 82, 83-84, 88, 136. 170, 

 222-226, 231, 234, 242, 252-253, 

 260, 330 



uses of, 18, 19, 242-252, 354 

 engine, 



body as an, 19, 35, 328, 339, 354, 



398, 409, 416 

 gas, 224, 262-265, 285, 547, 626, 



(263, 264) 

 oil, 276 

 steam, 18, 75, 224, 251, 259-262, 



267, 547, 558, 641, (251) 

 environment, 624 



as a source of knowledge, 3, 6 

 effects of, 3-6, 118, 315 



environment Cont'd 

 factors in, 3-6, 118, 315 

 nature of, 6, 12-14, 16, 17, 19 

 enzymes, 320, 322, 398, 400, 402-403, 



405, 423, 496, 624 

 epicotyl, 504-508, 624 

 epidemic, 360, 456, 468, 475 

 epidermis, 426, 624, (426) 

 epiglottis, 342, 624, (342) 

 equator, 134, 157, 158, 624 



heat, 132, 133, 627 

 equatorial calms, 132, 133, 624, 



(133) 

 erosion, 49, 50, 298-299, 306, 514, 



515, 624, (50, 294, 299) 

 esophagus, 398, 400-401, 624, (401) 

 ether, 180, 234, 236, 624 

 Ethiopia, 164 

 ethyl alcohol, 380, 624 

 Europa, 608, (274) 

 eustachian tube, 176, 624 

 evaporation, 46, 305, 448, 501, 624 

 excretion, 301, 312, 320, 322, 328, 

 340, 412, 416, 425-427, 459, 493, 

 496, 501, 624 

 hygiene of, 412-413, 427 

 excretory organs, 402, 403, 425, 427, 



624 



exercise, 347, 410, 465, (333, 334) 

 effect on body, 332-335, 421, 422, 



423, 434, 452 

 expansion, 

 of gas, 88 

 of matter by heat, 82, 87-88, 103- 



104 



of mercury, 86 

 of steam, 251, 260-261, 273 

 of water, 87-88 

 experiment, 8, 624 

 experimental method, 



check, or control, 62, 336, 406, 



442-443, 508, 509, 510 

 factors involved, 9 

 labels, 9 

 meaning and importance, 8-9, 



471 



experiments, ix-xii 

 expiration, 341, 624 

 extension, 14 

 extensor muscles, 330-331, 624, 



(330) 

 extinguishers, 36, 95-98, (96) 



