452 



INDEX 



Ice floes, 258 



Ichthyosaur, 153 



Idiacanthus ferox, 216 



Idioplasm, 291 



Immigration, 380 



Immune sera, 95 



Implements, 1 



Inbreeding, in man, 367 



Induction, parallel, 419; in insects, 

 420; somatic, 419 



Infertility, interspecific, 348; of hy- 

 brids, 349 



Inheritance, of acquired characters, 

 414, 415; acceptance of, 416; cir- 

 cumstantial evidence for, 417 

 alternative, 280; blending, 280 

 mosaic, 280; in four o'clocks, 281 

 in Andalusian fowls, 281 ; in Guinea- 

 pigs, 282, 283; in peas, 278; of more 

 than three characters, 284; of eye 

 color, 361; of hair color, 361; of 

 skin color, 362 



Insects, 136; adaptations for securing 

 food, 233; adaptive branching in, 

 253; diversity of, 138; metamor- 

 phosis of, 136; mouth parts, 138, 

 139; mimicry, 245; Paleozoic, 1^0; 

 Schroder's, 420; wings, 139 



Instincts, and natural selection, 396 



Insulin, 95 



Intraselection, 408 



Irises, 345 



Irish Elk, 389 



Irritability, 90 



Isolation, biological, 409; physical, 

 409; theory of, 409; spatial, 387 



Jack-in-the-pulpit, sex reversal in, 

 336; Siamese twins, 337 



Japanese beetle, 251 



Java, 198 



Java ape-man, 199 



Jaws, 73 



Jelly-fishes, 213, 214 



Johannsen, 354 



Jones, F. W., 193, 195, 197 



Jukes family, 368 



Jumping, 219; value of, 220; in in- 

 sects, 220; in vertebrates, 219 



Jurassic, 122; squids, 133 



Just (and Lillie), 301 



Kallikak Family, 370 

 Kangaroo, 219 



Kant, 8 

 Katabolism, 30 

 Kea parrot, 267 

 Kellicott, 367 

 Kiang, 183 

 Kidneys, 66 

 Kingdom, 26 

 Kingsley, 75 

 Krapina, 203 



Labium, of Anopheles, 234 



Labrum epipharynx of Anopheles, 234 



Lamarck, 9, 10, 11, 115, 385; and 



variation, 269 

 Lamarck's laws, 11, 414 

 Lamarckian theory, 413; errors of, 



428; value of, 424 

 Lance, 122 

 Leeuwenhoek, 8 

 Legs, of insects, 218, 233 

 Lemur, flying, 229 

 Lemuroidea, 188 

 Lethal factors, 320, 322 

 Lichens, symbiosis, 240 

 Life, 2, 3 ' 

 Light, adaptations to, in plants, 223; 



in animals, 224; pigmentation, 224; 



loss of eyes, 224 

 Lillie, 323', 335 

 Lillie and Just, 301 

 Limb buds, 47 

 Limbs, of elephants, 166 

 Limestone, 120 

 Line selection, 353 

 Linkage, 285, 306; effect on dihybrid 



ratios, 286; and sex, 286; in Dro- 



sophila, 307; in man, 310; in other 



organisms, 310 

 Linnaeus, 9, 388 

 Linophryne lucifer, 216 

 Llama, 184; skull, feet, teeth, 185 

 Lobster, 36 

 Locomotion, in terrestrial organisms, 



217 

 Locy, 10 



Loon, adaptations of, 213 

 Lou Dillon, 352 

 Loxodonta, 173 

 Lull, 122, 127, 133, 150, 160, 164, 



166, 168, 176, 217, 257, 388 

 Luminous organs, 216 

 Lung fishes, 130 

 Lush, 347 



