IV 



BIOLOGY AND HUMAN LIFE 



Embryo sac, 44 



Emotions, 153, 252 ff.; expression of, 

 255; organic effects of, 255 f,; con- 

 trol of, 266 ff. 



Endosperm, 69 



Energy, sources of, 102, 108, 140, 145, 

 217; daily consumption by body, 

 142, 144 f. 



Environment, and health, 365 ff., 



^ 406 ff . ; man's mastery of, 582 f . 



En'zyms, 128, 161, 308. See also Fer- 

 ments 



Ep i cot'yl, 68 



Epidemics. See Disease 



Erosion, 552 



Esophagus (esof'dgiis), 132 



Eugenics (u jen'iks), meaning of, 583; 

 importance of, 583 f. ; application 

 of, 588 f. 



Euglena (ugle'nd), 76 



Eustachian (ista'kian) tubes, 132 



Excretions, hygiene of, 194 ff.; as 

 health indicators, 196. See also 

 Wastes 



Exercise, 158, 265, 290 f. 



Exoskeleton, 28, 29, 454 



Expiration, 162 



Eyelids, 277 



Eyes, of insect, 15; human, 230 f.; 

 hygiene of, 236 ff. 



Factory regulations for health, 379 ff. 

 Fatigue, cause of, 384 f. ; and pace, 



385; dangers of, 385, 391; poisons 



from, 385 f. 

 Fats, 102, 104, 139, 140; origin of, 



109; digestion of, 136; fuel value 



of, 145 

 Feces (fe'sez), 194 

 Feeling, 18, 19 

 Feet, care of, 204 ff. 

 Ferments, 128, 129, 131, I34f., 161, 



178; in blood, 178, 180, 184 

 Fern, alternation of generations in, 



78 ; uses of, 434 

 Fertilization, 43 f., 472 

 Fertilizers for soil, 94 

 Fever. See Diseases, Texas fever, 



Trench fever. Typhoid fever. Yel- 

 low fever 

 Fibers, nerve, 220 ; plant, 417 f. 

 Fibrinogen (fi brin'o jen), 179 

 Fibrovascular bundles, 108, 115, 116, 



119 



Fire, use of, 372 f. ; forest, 557 



First aid, in asphyxiation or drown- 

 ing, 170 ff.; in bleeding, 188 f.; for 

 eye, 239 ; in industry, 392 



Fish, 87, 453 ff. ; development of, 88, 

 285 ; digestive system of, 276 ; 

 breathing in, 454 ; economic value 

 of, 455 f. ; reproduction in, 484 f. 



Fission. See Cell, division of 



Fitness, of organisms, 22 ; meaning 

 of, 535 ; natural, 536 f. See also 

 Eugenics 



Flatworms, 81, 332 



Flax, economic value of, 440 



Fleas and plague, 327 



Flowers, 1 3 ; structure of, 4 1 f . ; fer- 

 tilization in, 43 f., 473; adaptations 

 in, 48 f . ; and insects, 49 f. ; homol- 

 ogy and analogy in, 51 ff. See also 

 Plants 



Fluctuations, 505 f. 



Fly, dragon, 84; typhoid, 317, 319; 

 elimination of, 318 ff.; Hessian, 

 565 f. 



Follicle, 200 



Food, in seeds, 69 ; plant, 93 ; neces- 

 sary for protoplasm, 10 1, 140 f., 

 142; organic, 107; factors in mak- 

 ing, 107 ff.; origin of, 120, 417; 

 absorption of, I26ff. ; digestion of, 

 128 f., 131 ff.; choice of, 139, 141; 

 function of, 140; digestibility of, 

 142; nutritive value of, 142; com- 

 position of, I46f.; cooking of, I52f. ; 

 relation of, between organisms, 

 2991 ; protection of, 312, 353, 354 ff.; 

 and flies, 320 f. ; and bacteria, 353 f- ; 

 preservatives in, 354 ; and feeding, 

 368 f. ; national resources of, 542 ff. ; 

 preserving of, 542 f. 



Forest, man's dependence on, 549 ; 

 and air, 550; and water, 550; and 

 soil, 552 f. ; control of, 553 ff. ; fires 



in. 557 

 Fossils, 281 



Frog, development of, 212, 285; 

 structure of, 273, 275, 279; repro- 

 duction in, 487 



Fruit, 13, 43, 473 f.; and seed, 44 f., 

 474 ; fleshy, 45, 474 ; dehiscent, 

 474 f. 



Fuel, supplied in food, 140, 145, 147; 

 sources of, 419 f. 



Fumes and the lungs, 173 f., 381 



