710 



INDEX 



Henle's loop, 525 

 Hepatic caecum, 269, 272 

 Hepatic portal system, 315, 316, 519 

 Heredity, 581-620 



and enviromnent, 609-612 



human, 613-620 

 Hermaphroditic. See Monoecious 

 Hermissenda crassicornis, 264 

 Hernia, 540 

 Heterogamy, 530, 531 

 Heteroploidy, 609 

 Heterosis. See Hybrid vigor 

 Heterozygous, 587 

 Hibernation, 88 

 Hippasteria phnjgiana, 270 

 Hippocampus ktida. See Sea horse 

 Hirudo medicinalis, 198 

 Histology, 16, 70 



Holmes, Oliver Wendell, 264, 265 

 Holotricha, 134 

 Homing, in birds, 333 

 Homology, 210, 636, 637, 638, 639 



digital tips, 368 

 Homoptera, 221 



Homo sapiens, 106, 107, 356, 357, 358, 366 

 Homothermal. See Monothermal 

 Homozygous, 587 

 Homunculus, 561 

 Honeybee, 228-236 

 Hoof, 368 



Hooke, Robert, 56, 650 

 Hookworm. See Necator americanus 

 Hormone, 219, 435 



wound, 554 

 Horn, ventral, 416, 417 

 Horned toad, 327, 328 

 Horse evolution, 656, 657 

 Horsehair worms, 175 

 Humerus, 305, 306, 376, 381 

 Humor, aqueous, 398, 399 



vitreous, 398, 399 

 Huntington's Chorea, 615 

 Huxley, T. H., 652 

 Hyalella, 204 

 Hyalonema, 137 

 Hybrid, 587 

 Hybrid vigor, 600 

 Hydra, 67, 68, 77, 78, 141, 142, 143, 146, 383, 384, 



392, 393, 451, 452, 476, 491 

 Hydractinia, 151, 158 

 Hydranth, 149, 150 

 Hydrogen, 26 



ion, 40, 515 

 Hydrolysis, 41, 42, 460, 519 

 Hydrotheca, 150 

 Hydroxyl, 40 



ion, 40 

 Hyla versicolor, 300 

 Hylobates lar. See Gibbon 

 Hymenoptera, 221 

 Hyoid, 307, 378 

 Hyperopia, 402 

 Hyperthyroidism, 443, 444 

 Hypertonic, 54 



Hypodennis, 216 

 Hypohippus, 658 

 Hypopharynx, 225, 233 

 Hypophysis. See Pituitary 

 Hypostome, 141 

 Hypothyroidism, 442 

 Hypotonic, 54 



Ichthyornis, 334 



Ichthyosaurus, 661, 662 



Ichthyosis, 613 



Iguana iguana, 327 



Ileum, 461 



Iliac artery, 314 



Ilium, 305, 306, 380, 381 



Immunity, 515 



Implantation, 541, 542 



Inbreeding, 600 



Incisor, 4.54 



Incomplete dominance. See Blending 



Incurrent canal, 140 



Incurrent pores, 138, 139 



Incus, 405 



Individual, 75 



Induction, principle of, 574, 575 



Inductive Method, 5 



Inertia, 23 



Infraspinatus, 386 



Infundibulum, 447 



Inguinal canal, 538, 540 



Insect, breathing system, 476 



Insecta, 220-251 



Insectivora, 341 



Insertion, muscle, 303, 304, 385 



Inspiration, 479, 480 



Insula, 425 



Insuhn, 435, 436 



shock, 437 

 Intelligence quotient (I. Q.), 612, 616, 617 

 Intermediate host, 168 

 Internal buds, 138, 139 

 Interphase ( resting cell ) , 552, 553, 554 

 Interstitial cells, tissue, 438, 446 

 Intestinal vein, 315 

 Intestine, small, 311, 312 



large, 311, 312 

 Inversion, 608 

 Invertase, 464 



Invertebrate, comparative, 280 

 Iodine, 296 

 Ion, 28 



anion, 28 



cation, 28 

 Iris diaphragm, 398, 399 

 Iron lung, 481 

 Ischium, 305, 306 



Islets of Langerhans, 434, 435, 436 

 Isogamy, 530, 531 

 Isolation, genetic, 654-655 



geographic, 654-655 

 Isotonic, 53 

 Isotope, 27 



