INDEX 



417 



Hemophilia, 130 



Heparin, used to prevent blood clotting, 



130 

 Hepatic- portal sj^stem, 126 

 Hermaphrodite reproductive system. 180 

 Hermaphroditism, 166-168 

 Herpetologist, 257 

 Heteromorphes, 246 

 Heterozygote, 227 

 Hexactinellida, 262 

 Hippocampus, brood pouch of, 188 

 Hippocrates, 3 

 Hirudinea, 270 

 Holothurioidea, 268, 269 

 Homolecithal egg, 198 



cleavage of, 201 

 Homologous chromosomes, 224, 225 

 Homology, in adult structure, 263 



in blood composition, 351 



in embryonic structure, 254, 255 



as evidence of kinship, 252-255, 349- 

 351 



in physiological characters, 351 

 Homozygote, 227 



Honeybee, influence of food on, 288 

 Hooke, Robert, 10 



and microscope, 9 

 Hookworm, 266, 267 

 Hormones, 104, 153-158 

 Horse, evolution of, 339-342 

 Human evolution, 335 

 Humerus, 93 

 Huxlev, T. H., spread of evolution theory 



by, 361 

 Hybridization, as source of evolution, 



357, 358 

 Hydra, 71, 72, 73, 75, 262 



coelenteron in, 101 



nervous system of, 140, 141, 142 



reproduction of, 172 

 Hydranth, 172, 173 

 Hydrochloric acid, in stomach, 104 

 Hydrogen atom, 32 

 Hydroid, 263 



Hydrorhiza, 172, 173 » 



Hydroxyl ion, 36 

 Hydrozoa, 264 

 Hyla, distribution of, 310 

 Hyoid, 90 

 Hypostome, 172, 173 



Hvdra, 71 , 72 



Ileum, 102 

 Ilium, 92, 93 



Incomplete metamorphosis, 215, 216 

 Incubation, 187 



Indeterminate development, 218 

 Index fossils, 329 

 Inductive method, 5 

 Insect, cleavage in, 201 

 Insecta, 272, 274 

 Insertion, of muscle, 94 

 Insulin, 155 



Intelligent animals (I^amarck's classi- 

 fication), 247 

 Intercellular bridges, 28, 29 

 Internal respiration, 114, 119 

 International code, 249, 250 

 Interphase, 55, 56 

 Intersterility, specific, 353, 365, 366 

 Interstitial cells, 156 

 Intestine, 80, 101, 102 



in embryo, 205, 207, 209, 210, 212 



of flatworra, 102 



of frog, 102, 103 



large, digestion in, 106 



of man, 103 



secretion of, 105 

 Invagination, 204, 207 

 Involuntary muscle, 96 

 Ions, 34-36 

 Ischium, 92, 93 

 Islands of Langerhans, 155 

 Isogamete, 161 

 Isogamy, 161 

 Isolation, geographic, 365 



reproductive, 365, 366 



Jejixnum, 102 

 Jensen, Zacharias, 10 

 Jurassic, 330 



K 



Kar^'okinesis, 55-62 



Kidney, 80, 135, 136, 137, 178, 179, 183 



Kinetic energy, 37 



King crab. 274 



