Exhaling, 228-230, 228 



Experience, and learning. 295, 296 



Exploration, 4-8, 6, 7, 530, 567 



Extinct, def., 530 



Extinction, of wildlife, 405-406 



Eye, compound, 41: grasshopper, 45; heredity of 



color, 508; hciedity of color blindness, 473, 473; 



human, 280-281, 280, 281; of white potato, 449 



Fi, def., 467 



F2, def., 467 



Fabre, Jean Henri, 7-8 



Fainting, 217 



False Solomon's seal, 407 



Families, animal, 98, 98, 99, 99, 100; plant, 84-90 



Family, in classification, 15, 99 



Family life, animal, 434 



Farming, and soil destruction, 403 



Farms, inspection of milk, 346-347 



Fat cells, 129, 132 



Fats, 110, 112, 196-197; absorption of, 221; in 

 common foods, 172; composition of, 143; in diet, 

 174-175; diffusion of, 124; synthesis of, 143; test 

 for, 116 



Fat tissue, use in body of, 174-175 



Fatty acids, 196, 198 



Feathers, 20, 21, 65; in flight, 23 



Federal Food, Drug, and Cosmetic Act, 242 



Feeble-minded, def., 510-511; segregation of, 512 



Feeble-mindedness, heredity of, 511-513; statistics 

 concerning, 513 



Feelers, butterfly, 43; moth, 43; use of, 41 



Fehling's solution, 116 



Felis (cats), 97, 98; cougar, 98; domestica, 98; leo, 98 



Female, ant, 47; characteristics, 421-422; deer, 421; 

 frog, 422; gametes, 422, 423; malarial protozoan, 

 351, 417-418; sex organs, 421, 422, 422 



Fermentation, 77; and Pasteur, 322-323 



Fern, 79-80; Boston, 499, 499; classification of, 91; 

 Christmas, 72; Florida, 137; mutation, 499; pro- 

 thallus, 446; reproduction of, 445-447; spore 

 cases, 415; young plant, 446 



Fertilization, in bird, 430; and chromosome number, 

 461-462; def., 418; and development, 424; ex- 

 ternal, 423-424, 427-428; in fern, 446; in fish, 

 423-424; in flowering plants, 439, 442-443, 443; 

 and heredity, 466-467; internal, 429-430; in land- 

 living animals, 429-430; in malarial protozoan, 

 351, 417-418; in rabbit, 432 



Fertilization membrane, def., 424 



Fertilized egg cell, def., 418, 424, 425, 430; of flower- 

 ing plant, 443, 443; of frog, 428, 428 



Fertilizer, and soil restoration, 405 



Fever, 241; blisters, 340; and drugs, 332; malaria, 351 



Fibers, root, 152; stem, 156 



Fibrin, 211 



Fibrinogen, 208. 211 



Fibrous root, 149 



Filament, flower, 439, 441; spirogyra, 74, 415 



Filial, def., 467 



Filterable virus, 324, 339-431 (see also Virus) 



Filters, for water supply, 345; porcelain, 339 



Firefly, 46 



First aid, 215 



Fish, 31-34, 32, 33; in balanced aquarium, 378 379 

 brain, 273; development of, 424-427, 425, 455 

 flying, 33; hatcheries, 406; and learning, 290 

 migration, 33-34; muscle cells, 129; reproduction 

 of, 423-427; sperm, 423 



Fission, in ameba, 412-413, 413; binary, def., 413; 

 in Paramecium, 412-413, 412 



Fissure, of cerebrum, 271 



Fitness (see Adaptations) 



Flagellum, of bacteria, 312, 313; of euglena, 64 



Flatfish, 33 



Flatworm, 40, 58, 58, 66 



Flax, 89, 383 



Fleas, as germ carriers, 348 



Fleming, Dr. Alexander, 12 



Flies, 44-45 



Flight, of birds, 23-26 



Floods, and forests, 399-402 



Floral envelope, 439 



Flounder, 33 



Flower, structure, 439, 439 



Flower color, inheritance, 464-467 



Flowering plant, ages, 80; characteristics, 80; classi- 

 fication of, 81, 83-84, 91; kinds of, 82-90; fife 

 cycle, 445; reproduction, 438-445, 446-447; sapro- 

 phytic, 374 



Flowers, needing protection, 407 



Fly, and spontaneous generation, 411 



Focus, of eye, 280-281; of microscope, 114 



Food chains, 373; and earth history, 375 



Food pipe, 229 (see Oesophagus) 



Food vacuole, of Paramecium, 62 



Food, absorption of, 188-189, 197-198; absorption 

 of in villi, 206; Basic Seven, 182; calories, 168- 

 174, 172; canning, 180-181, 385; choosing of 

 (diet), 167-187; compounds, 167-168; def., 167; 

 diffusion into capillaries, 206-207; digestion, 188- 

 205, 197; energy in, 169-175; movement in canal, 

 188, 192-193; pushcart sales of, 347; reasons for 

 studying, 167—168; and reflexes, 262-263; sources 

 of man's, 167; table of information, 172-173; and 

 typhoid, 348; vitamins, 173, 176-183, 183 



Forest fixe, 399, 400, 401; fighting, 402 



Forest ranger, 402; at work, 401 



Forests, 399-402; and flood control, 399-402; and 

 humus, 400; and soil erosion, 402; destruction, 

 400; graph of extent, 400; uses of, 399 



Fossils, def., 525, 526-530, 533-546, 564-571; dia- 

 gram of relationships, 541; early man, 564-571; 

 elephant series. 543; formation of, 526; how 

 discovered, 529; hunting, 528-530, 530; illustra- 

 tions of, 525, 526, 527, 530, 536, 538, 541, 542, 

 543, 567; insect, 528; Paleozoic, 535-537; Pro- 

 terozoic, 535; reconstruction of, 530; series of, 

 543; significance of, 530, 540-542, 543-544, 552- 

 553; snail series, 543; succession in rocks, 533; 

 summary of, 544; and tar pool, 527; tree, 541; 

 types of, 526-528 



4-H Club health champions, 310 



Four o'clock, blossom, 465; heredity in, 464-467; 

 hybrid cross of, 467 



Fox, mutation, 499; red, 98 



Fraternal twins, 514 



Fringed gentian, response to light, 303 



Frog, 16, 31; brain, 273; capillaries, 207; chromo- 

 some number (leopard frog), 459; classification of, 

 30-31, 65; development of, 428; dissection of, 202; 

 egg, 423; excretory organs, 422; metamorphosis 

 of, 428-429; muscle cells, 129; parthenogenesis, 

 424; reproduction, 427-429; reproductive organs, 

 422; skeleton, 548; sperm, 423; spinal reflex, 279; 

 study of tissues, 12, 134-135; and thyroxin, 247 



Fronds, 79; of fern, 446 



Fruit, chlorophyll in, 139; cotton, 383; def., 444; 

 444; development, 443-445, 444 



Fruit fly, 45; chromosome number of, 459; giant 

 chromosome, 474; heredity, 470, 471; in milk 

 bottles, 471; mutations, 479-481, 480, 481 



605 



