560 



INDEX 



383; paired, 356; position of, 

 379; segregation of, 354; sup- 

 plementary, 386, 398 



Genetics, 419; application of to 

 human progress, 553 



Genius, inheritance of, 520 



Genotypes, 3C2; nunilier of, 386 



Genus, 413 



Geographical distribution, 417 



Geotropism, 110 (fig.) 



Germ cells, 297 (fig.), 309, 324; 

 early history of, 310 (fig); re- 

 ducing division of, 310 (fig.), 

 342 (fig); of plant and animal 

 compared, 342 



Germination and spring growth, 

 enzyms concerned in, 69 



Giants, 173 



(lifted children, 520 



Gills, 100 



Giraffe, evolution of, 425 



Glands, ductless, 171; hormone 

 ' manufacturing, 171; secreting, 

 03 (fig.) 



Glucose, 96, 263 



Go<ldard, H. H., 520 



Goitre, 173 



Gonium, 28 (fig.) 



Grafts, 345 



Granulohacter, 275 



Grasping, 133 



Grasslands, 463 



Gravity as a stimulas, 110, 135 



Greeks, 502, 527 



Green plants, 5, 36 



Grouix, family, 194 



Growth, 17, 49, 305; cell, 281 



Growth metalwlism, 75; waste in, 

 80 



Guano, 272 



Guard colls, 58 



Guinea pigs, coat-color, 398 (fig.) 



Gut tat ion, 61 



Hahit formation, 164 



lladromase, 265. 



Hair, human, color of, 507; form 



of, .507 

 Hairs, root, 54 (fig), 276 

 Hand, flexibility of, 534 

 Ho.tring, 136; organ of, 143 

 Ho.trt, S7; mu.Hclc, 125 

 Hemoglobin, 88, 102, 188 

 Herds, 194 



Heredity, 8, 350, 424; Mendel's 

 laws of, 351; principles of, 378; 

 through cytoplasm, 357 

 Heritable characters in man, 506 

 Hermit cralw, 196 (fig.) 

 Heterocyst«, 320 

 HeterosiKjry, 332 (fig.) 

 Hiliemation, 9<), 249 

 Higher animals, circulatory sys- 

 tem of, 87; kidneys of, 105 

 Higher plants and nitrifying or- 



gani.sms, 274 

 Hill Folk, 521 

 History of the horse, 409; earlier, 



of the human race, 496 

 Hoemophilia, 507 

 Holarctic realm, 477 

 Homology-, 414 (fig.) 

 Honey-bee, 194 



Hooded pattern in rats, 398 (fig.) 

 Hook, Rol)ert, 14 

 Hookworm, 203, 226 

 .Hormone, 118, 171, 513; -manu- 

 facturing glands, 171; of ad- 

 renals, 175; of interstitial glands, 

 174; of pancreas, 174; of pitui- 

 tary body, 173; related to racial 

 characteristics, 177; of thyroid 

 gland, 172, 183 (fig.) 

 Horse, history of the, 409 (fig.); 



speed inheritance in, 402 

 Host, 209; effects of parasite on, 

 20;}; relation of to parasite, 

 218 

 Human Ixihavior, 532; inheritance, 



505 

 Human race, earlier history of the, 



496; traits, 505 

 Hunger, 137; emotions connected 



with, 166 

 Hybrid, 349; vigor of, 393 

 Hvbridization, 392 

 Hydra, 29 (fig.), 85, 293 

 Hydrohises, 67 

 Hypothesis, Von Bayer's, 43 

 Hysteria, 186 



Ideals, human, 550 

 Image formation, 144 

 Immediate causes of death, 253 

 Immigration, 526 



Immortality of the unicellular or- 

 ganisms, 254 

 Immunity, 233 



