656 



INDEX 



Honey stomach, bee, 208, S09 

 Hoofs, 493 



Hooke, Robert, 138, 311 

 Hookworm, 216 



control of, 616 



infection by, 615-616 



larvae of, 223 



life cycle of, 22S-224 

 Hooton, 544, 552, 563 

 Hormiphora, 83 

 Hormones, 310, 391, 396, 399, 402, 467 



sex, 471 

 Hornaday, W. T., 537, 599 

 Horns, 493 

 Horses, 447, 477, 487, 515, 541, 544, 545 



blood relationship of, 514 



evolution of, 511, 512, 513 



wild, 557 

 Horseshoe crab, 514 

 Host, 217 



Host-parasite conflict, 217 

 Host-parasite equilibrium, 217 

 Host-parasite relationships, 217 

 Hotsprings, 491 

 House fly, 336 



foot of, 617 

 Houseman, Laurence, 496 

 Houssay, 401 

 Howard, Dr., 568 

 Howell, A. H., 578 

 Hrdlicka, 555, 561 

 Humerus, 332 

 Humming bird, 545 

 Hurst, C. C, 470, 503 

 Huxley, 500, 516 

 Hybrid vigor, 455 

 Hybrids, 441 

 Hydra 



budding in, 184 



digestion in, 182 



locomotion in, 180 



maturation in, 183, 184 



nerve net of, 183 



neuro-sensory cells in, 183 



reaction to stimuli by, 182-183 



regeneration in, 184 



reproduction in, 183-184 



reproductive organs of, 184 



respiration in, 182 

 Hydroids, 185-186, 334 

 Hydrolase, 280 

 Hydrolytic, 280 

 Hydrophytes, 5 

 Hydrotheca, 185 

 Hydrozoa, 81 

 Hygroscopic, 176 

 Hymenoptera, 102 



parasitic, 221 

 Hyoid, 329 



Hyperglycemia, 401 

 Hyperosmotic, definition of, 136 

 Hyphae, mold, 173 

 Hypnotoxin, 180 

 Hypohippus, 511 

 Hypomere, 425 

 Hypophysis, 348, 399 

 Hyposmotic, definition of, 136 

 Hypostome, 179 

 Hyracoidea, 117 



Ichneumon fly, 46, 221 

 Ichthyopsida, 507 

 Ichthyornithiformes, 113 

 Identical twins, 432 

 Igorots, 561 

 Ileo-caecal valve, 292 

 Imago, bee, 213 

 Immunity, 489 



active, 627-632 



definition, 625 



mechanism of, 626-627 



passive, 632-634 



racial, 625-626 



types of, 625-626 

 Inbreeding, 454 

 Incas, 562 

 Incisors, 286, 563 

 Inclusions, cell, 129 

 Incubation period in diseases, 635 

 Independent assortment, 446, 447, 450, 



458, 460 

 Indeterminate cleavage, 432 

 Indians, 562 



Inferior vena cava (postcava), 307 

 Influenza, 624-625 

 Infraesophageal ganglion, 344 

 Infundibulum, 348, 400 

 Infusoria, 77 

 Ingen-Hausz, 241 

 Inheritance, 522 



criss-cross, 4^0 



cytoplasmic, 463 



extra-biological, 436 



maternal, 464 



social, 436 

 Inner ear, 361 



Insect pests, enemies of, 587 

 Insect poisons, 588 

 Insecta, 99, 103 

 Insectivora, 115 

 Insectivores, 534, 540 

 Insects, 99, 103, 2M, 315, 334, 336, 

 344, 513, 521, 532 



body plan of, 200-203, 202 



casual carriers, 618 



characteristics of, 200-201, 202 



damage by, 583, 586 



diseases carried by, 617-621 



