INDEX 



Function, biological idea of, 17 

 Fungi (fun'jl), 76, 79, 299, 300, 431 ff., 



470, 557 ; causing disease, 335 ; 



fatal to insects, 570 



Gametes (gam'etz), 471, 472, 486, 515 



Ganglia, 220 



Garbage, 357, 360, 368 



Gases, exchange of, 163; injurious, 



Gastric juice, 132 



Genealogical tree, of plant life, 74 ; 

 of animal life, 75 



Germs, 307 



Gills in respiration, 176, 454 



Glands, salivary, 133; of intestines, 

 133; of stomach, 134; pituitary, 

 178, 283; of skin, 199, 200; duct- 

 less, 212 ; reaction in, 217 f. 



Gluten (gloo'ten), 102 



Glycerin (glis'erin), 135 



Glycogen (girko jen), 177, 218 



Goosefoot, economic value of, 438 



Grafting, 467 ff., 482 f. 



Grape, economic value of, 441 



Grass, economic value of, 436 



Grasshopper, i5ff. ; development of, 

 27 f. 



Green slime, 59, 113 



Growth, 18, 20 f. 



Gullet, 132 



Gut, 133. See also Intestine 



Gymnosperms (jim'no spurmz), 79, 



434 



Habits, 243 f. ; eating, 139, 148, I52ff. ; 

 health. 157 f., 264 f., 370 ff. ; made 

 by practice, 244 f. ; aspects of, 

 245 ff. ; importance of, 247, 402 ; in 

 control, 248, 266 ff. ; emotion, 256 f.; 

 formation of, 257 ; tobacco, 422 ff. 

 Haemocyanin. See Hemocyanin 

 Haemoglobin, ^^v Hemoglobin 

 Hair, of mammals, i99f. ; of plants, 



417 f. 



Hands, care of, 204 



Head, of insect, 15; skeleton of, 283 



Health, and biology, 100; food and, 



140 f., 353 ff. ; habits conducive to, 



157 f., 264 f. ; importance of white 



corpuscles to, 179; disease and, 



261 f. ; influenced by mind, 263 f. ; 



public regulations for, 354 ff. ; home 



and, 365 ff. ; education for, 370 ff. ; 



mental, 387 f . ; protecting, 398 ff. ; 

 research and education for, 403 ; 

 work and, 406 f. ; specialties related 

 to, 407 ff. ; plants and animals in 

 relation to, 420 f. 

 Hearing, 232 



Heart, 176, 181 f. ; disorders of, 189 f. ; 

 leaky, 190 ; care of, 190 f. ; training 

 of, 191 

 Heat, measurement of, 140. See also 



Calorie 

 Heath, economic value of, 442 

 Hemocyanin (he nio si'd nin), 176 

 He mo glo'bin, 141, 176, 178 

 Heredity, and disease, 346 ; and 

 breeding, 501, 507 ; in plants, 509 ; 

 in animals, 522 ff. ; in man, 584 ff. 

 Hill, Dr. Eben C, 180 

 Home, importance of, 365 ; location 

 of, 365 f. ; suitable, 366 f. ; cleanli- 

 ness and sanitation in, 367 f. ; and 

 community, 373 ; standards for, 



373 f-^ 



Ho moKo gy, in animals, 34 ff., 273, 

 275 ff., 279 ; in flowers, 51 ff. 



Hookworm, 302, 334 f. 



Hor'mones, 178 



Host, and parasite, 300 ff. ; inter- 

 mediate, 322 



Hu'miis, 1 13 



Huxley, Thomas H., 415 



Hybridizing, 504 f. 



Hy'brids, instability of, 506 ; preserv- 

 ing, 506 f.; inbreeding, 511, 523 



Hypocotyl (hi p6 kot'il), 68 



I ma'go, 29 



Immunity, natural, 338 ; modifiable, 

 339 ; artificial, 343 ; passive, 343 ; 

 active, 343; breeding for, 515 



Individual variation, 491 



Industry, biology and, 379 f. ; physi- 

 cal conditions in, 380 f. ; hazards 

 in, 381 ff. ; hours of work in, 386 f. ; 

 mental health in, 387 f. ; accidents 

 in, 388 ff. ; first aid in, 392 ; women 

 and children in, 392 f. ; occupa- 

 tional diseases, 393 f. 



Infancy, 488 f. 



Infant mortality, 359, 374 f. 



Infection, 310; protection against, 

 312; of food, 317 f., 320 



Inhibition, 244, 248 



Inorganic substances, 18, 107 



