INDEX 



425 



Homologous, 233 



Homologous chromosomes, 240, 241, 242, 

 244 



Homology, 233, 348; origin of, 234; in 

 taxonomy, 266 



Homo neanderthalensis, 336, 337 



Homozygote, 242 



Homozygous, 242 



Hooke, Robert, 14, 18, 19 



Hooker, Joseph, 342 



Hormones, 144, 154, 159 



Horse, 319, 333, 351, 358; age indicated 

 by tooth pattern, 328; evolution of, 

 324-328, 357; evolution of, as case of 

 orthogensis, 361; relation to envi- 

 ronment, 328 



Horses, fossil, 317 



Horse series, 332 



Host, 278 



Hump, in camel series, 329 



Huxley, Thomas, 22, 342, 343 



Hyacinth, mitosis in, 77, 78 



Hybrid, 243 



Hybridization, 256; evolution by, 362 



Hydra, 94, 95, 96, 106, 115, 173, 206; 

 absorption in, 146; budding in, 168; 

 hermaphroditism in, 190; nervous 

 mechanism of, 138; neuromuscular 

 cell in, 138; viviparity in, 195 



Hydractinia, 96, 97, 99; budding in, 168 



Hydractinia echinata, 97 



Hydranth, 97, 186 



Hydra oligadis, 184 



Hydra viridissima, 184 



Hydrochloric acid, in gastric secretion, 

 144 



Hydrocorallinae, 98; classified, 269 



Hydroids, 96 



Hydrolysis, 52 



Hydrorhiza, 97 



Hydrotropism, 285 



Hydrozoa, 96, 98, 99, 186; budding in, 

 168; classified, 269, 272; colonies in, 

 96-98 



Hyla evittata, range of, 291 



Hyla fuhrmanni, carrying of eggs, 200 



Hyla gratiosa, range of, 291 



Hyla squirella, range of, 290 



Hyla versicolor, range of, 290 



Hymenolepis murina, 102 



Hymenoptera, 181 ; classified, 270 



Hyoid apparatus, 135 



Hypertonicity, 187 



Hypostome, 97 

 Hypotonicity, 187 

 Hypotricha, classified, 268 

 Hyracoidea, classified, 271 



Ichneumon flies, disposition of eggs, 198 



Ichthyornithiformes, classified, 271 



Ileum, 117 



Ilium, 138 



Imbibition, 60, 147 



Immortalitj^ of germ cells, 236 



Incisors, in elephant series, 320 



Incubation, in birds, 198; in python, 199 



Independence of germ cells, 235-238 



Index fossils, 315, 319 



Indian elephant, 321, 322. 323 



Indirect cell division, 71 



Individuality of chromosomes, 79 



Industrial organization, 92 



Inferential evidence of evolution, 354 



Infusoria, 29, 30, 32, 62, 177, 180; classi- 

 fied, 268, 271 



Inheritance, of albinism in guinea-pigs, 

 243-250; of black color in guinea- 

 pigs, 243-250; of rough coat in 

 guinea-pigs, 247-250; of smooth 

 coat in guinea-pigs, 247-250; of two 

 pairs of characters, 247-250 



Insect, figure of leg, 134 



Insecta, classified, 270, 273 



Insectivora, classified, 271 



Insectivorous animals, 280 



Insects, 173; classified, 273; copulatory 

 habits of, 193; development of eggs, 

 195; egg carrying in, 200; egg case 

 of, 198; fertilization in, 194; fossil, 

 310; gall-forming, 281; origin of 

 germ cells in, 208; parts fossilized, 

 311; society formation in, 278; vivi- 

 parity in, 195 



Intake in plants, 48 



Intelligence, in choice of habitat, 284; 

 seat of, 162 



Interalveolar substance, 35, 36 



Intercellular cement, 109 



Interglacial stage, second, 336; third, 336 



Intermarriage of races, 258 



Intermedium, 138 



Internal gills, 233 



Internal organization, 108 



Internal secretions, 154 



Intervertebral cartilage, 136 



Intervertebral foramen, 136 



