INDEX 



1507 



germinal variations, 1096 

 germinal variations, causes of, 1097 

 germ plasm — 



climatic influence, 1050 



continuity of, 740, 1099, 1465 

 gestation, length of, 796 

 gigantism, 298 

 gland, thyroid, 18 

 glands, ductless, 18 

 goitre, 295 



gonadial hormones, 464 

 gonads, 465, 10 16 



internal secretion, 492 

 "good species," criterion for, 712 

 graft-hybrids, 470 

 grafting experiments, 749 

 grafts, 469 

 Great Ice Age, 889 

 Greek evolutionism, 912 

 growth, 15 



and movement, 322 



and reproduction, 456 



differential, 170 



form and variation, 957 



instability induced by, 20 



limit of, 17 



of crystals, 31, 32 



of lost parts, 17 



of parts, 18, 23 



of planarian worm, 17 



periodicity, 18 



vegetative habit, 950 

 gulls, black-headed, 213 



Habit, change from naturalisation, 



1044 

 habits and habituation, 932 

 habits defined, 606 

 haemoglobin, 11, 14 



composition of, 412 

 hair, colour of, 431 

 half -monkeys, 1157 

 health, 1205 



of nation, improvement in, 12 10 

 Heidelberg man, 11 50 

 hereditary buds, 10 10 

 hereditary characters, persistence of, 



983 

 hereditary factors, 10 11 

 hereditary factors in chromosome, 979 

 hereditary genius, 1324 

 heredity, 981 



and medicine, 1222 



and sex characters, 1028 



and variation, 1005, 1093 



defined, 1098 



heritage, extra-organismal, 554 

 hibernation, 60, 61, 99 



fat deposition before, 61 

 hierarchy of syntheses, 657 

 higher faculties — 



application of, 1425 



origin of, 1420 

 Himalayan jungle, 1021 

 histiocytes, 438 

 hive-bee, 123 



economy, 128 



evolution of, 1085 

 Holism, 447, 1 1 14 

 homing, 609 

 homologies of bird and reptile, 



881 

 homology, 675 



homoplasty, definition of, 680 

 honey, 221, 222 

 honey-guides, 418 

 hormones, 18, 291, 491 



gonadial, 464 



injection of, 1028 



of reproductive organs, 464 



role of, 1446 

 human anatomy, 1236 

 human individuality, development 



of, 1296 

 human influence in plant ecology, 



1286 

 human origins, 11 68 

 human progress, nature of, 1165, 1167 

 human societies, beginnings of, 11 62 

 humoral function of blood, 673 

 hunting-stage, significance of, 11 79 

 Huxley, 1457 

 hybridisation, 1028 

 hypophysis, 298 



Ice Ages, 904 

 Ichthyosaurs, 838 

 immunity, 349, 441 



acquired, 10 12 



artificial, 351. 442 



by disease, 352 



Ehrlich's theory of, 352 



to poisons, 1064 

 implantation experiments, 1028 

 in-breeding effects, 473 

 incipient structures, 926 

 individual development, 1105 

 individual experience, 1247 

 infective organisms, 855 

 inheritance, Karl Pearson on, 568 

 injection of hormones, 1028 

 insect communities, 117 



