INDEX 



69? 



Food supply, essentials of an adequate, 

 332 



Food-taking, of plants and animals, 44 



Food vacuole, of amoeba, 218 ; of Para- 

 mecium, 220 



Forestry, good, 579-581 ; profession of, 

 652 



Forests, methods of conservation of, 

 584-585 ; need of conservation, 579- 

 587 ; wastes in, 581-583 



Forest trees, injured by insects, 565 



Fossils, story told by, 271-274 



Frog, breathing of, 251 ; circulatory sys- 

 tem, 251-252 ; digestion of, 250-251 ; 

 digestive system, 367-368 ; digestive 

 tract compared with man, 368 ; food- 

 getting, 250, 251 ; laboratory study of, 

 250 ; life history of, 252-254 ; mouth 

 compared with man's, 363, 364 ; re- 

 production of, 252-254 ; respiratory 

 tract compared with that of man, 403 ; 

 sense organs, 250 



Fruit, definition of, 87-88 



Fruit fly, Mediterranean, 566 



Fruits, how formed, 86-88 ; used as food, 

 526-528 



Fruit trees, injured by insects, 565 



Fuel value, of foods, 328 



Functions, of living things, 36-52 



Fungi, characteristics of, 181 ; destruc- 

 tive, 193-197 ; kinds of, 181-199 



Fungus, shelf, 194-195 



Furs, value of, 540-541 



Gall insects, value of, 561-562 



Gamete, female, 205, 615 ; male, 205, 615 



Gametophyte, of fern, 204-205 ; of moss, 

 203 



Ganglion, 430 



Garden fruits, and vegetables, used as 

 food, 526-527 



Gardening, 13-14 



Gases, in living things, 27-28 



Gastric digestion, conditions most fa- 

 vorable for, 369-370 



Gastric glands, 371 



Gastric juice, action of, 371-372 ; com- 

 position of, 371 



Gastropods, 241 



Gastrula, 617 



Generation. See Alternation of genera- 

 tion 



Genes, definition of, 626, 627 ; function 

 of, 627 ; location in chromosomes of 

 fruit fly, 627-628 



Genus, 178, 179 



Geographic distribution, of living things, 

 305-309 



Germ cells, 627; development of, 630; 

 Weissman's study, 670 



Germination, factors necessary for, 120- 

 121; of seeds, 115-130; use of food 

 supply of corn during, 128 



Giants, probable cause of, 393 



Gills, of crayfish, 233; of fish, 245, 

 246 



Gland, meaning of, 361 ; structure of, 

 362 



Glands, ductless, 361, 392-395; en- 

 docrine, 361, 392-395; gastric, 361, 

 371 ; intestinal, 377 ; liver, 361 ; loca- 

 tion in man, 392 ; lymph, 399 ; of 

 skin, 316-317; oil, 316, 317; pan- 

 creas, 361 ; salivary, 363 ; sebaceous, 

 316, 317; sweat, 316-317, 414, 415 



Glomerulus, of kidneys, 413 



Glottis, 370 



Glycogen, 394-395 ; in liver, 375, 376 



Goiter, cause of, 393 



Goldfinch, American, 555 



Grafting, in animals, 614; in trees, 613, 

 614 



Grass family, 208 



Grasshopper, 62-65; characteristics of, 

 59 ; diagram of, 62 ; eyes of, 63, 64 ; 

 food-taking of, 64-65 ; laboratory 

 exercise on, 62—63 ; life history of, 

 64-65 ; muscular activity of, 63 ; near 

 relatives of, 65 ; order of insects, 59, 

 238 ; sense organs of, 64 



Gravity, 294 ; demonstration on effect 

 on roots, 140-141 ; effect on plants 

 and animals, 41 



Green plants, make food of world, 115- 

 173 



Growth, of plant, cause of, 123-124 



Guard cells, of stomata, 152 



Gullet, 364, 368 



Gulls, at Salt Lake City, 303 



Gymno sperms, 205-206 



Habit, effect of drink, 449-451 



Habits, different kinds of, 444-445 ; 

 food, 347 T 348; formation of, 444- 

 445 ; hygienic breathing, 407 ; im- 

 portance of forming right, 445-446 ; 

 meaning of, 443 ; of eating, 380 ; rules 

 for forming, 446-447 



Haemoglobin, 387, 404 



Hairs, roots, 135-136 



Harvey, William, 656 ; on circulation of 

 blood, 658 ; on germ cells, 658 



Hawks, 560 



Hay fever, 106 



Hay infusion, life in, 303-305 



Health, agencies, 507-511, 601; and 

 biology, 1-2 ; man control of environ- 

 ment for, 455-511; positive, 482; 

 work of department of, 508-511 



Health habits, of nervous system, 447- 

 448 ; of sense organs, 448 



Health work, of national government, 

 600 ; profession, 650 ; special agencies 

 in, 601 ; state and city supervision of, 

 600-601 



Hearing, organ of, in man, 438 



