INDEX 



615 



Vermiform appendix, 322, 408, 519 



Vertebrae, 31G, 320, 423 



Vertebral column, 300, 310, 318, 320, 43S, 520 



Vertebral discs, 400 



Vertebrata, 308, 310, 334, TAl 



Vertebrates, 117, 310-425, 440, 441. 442, 444, 449, 



463, 400, 518, 520 

 Vertical distribution, 503 

 Vertical life zones, 502-503 

 Vertical migration, 503 

 Vesalius, 650, 551 

 Vestigial structures, 51S, 619 

 Villi, 34, 323, 439 



placental, 418 

 Vipers, 380 

 \'irchow, 49 



Visceral ganglion, 210, 213 

 Visceral mass, 211, 219 

 Visceral muscle, 100 

 Visceral pain, 445 

 Visceral part of skull, 320 

 Visceral sensations, 445 

 Viscosity, 9 

 Vision {see Sight) 

 Vital activities, 21 

 Vital force, 24, 553 

 Vitalism, 24 

 N'itamins, 37, 455 

 Vitelline membrane, 376 

 Vitrella, 256 

 Vitreous body, 223, 332 

 Viviparity, IOC 

 Volvox, 81, 93 

 Volvox. aureus, 80 

 Vomiting, 468 

 Von Baer, 265, 554 

 Von Mohl, 18, 554 

 Vorticella, 83, 84 



W 



Wading birds, 401 

 Walking legs, 250, 251, 253 

 Walking sticks, 274, 283, 486 

 Wallace, 617, 521 

 Walruses, 414, 421 

 Wandering cells, 131 



(See also Leucocytes) 

 Warbler, beak, 399 

 Warm-bloodedness, 408, 450 

 Warning coloration, 480 

 Warts, 366 

 Wasps, 291, 295, 485 

 Water, 19, 20, 38, 454, 455, 460, 479, 501 



beetle, 274, 278 



birds, 404 



boatmen, 274, 284 



fleas, 105, 202 



moccasin, 380 



striders, 10, 284, 481 



tubes, 211, 212 



vacuoles, 64 



vascular system, 194-195, 201, 545 

 Wax, 282, 403 

 Weasels, 413 



Webs, spiders, 299 

 Webworm, 285 

 Weevils, 285 

 Weismann, 94, 451, 517 

 Whalebone, 417, 421 

 Whales, 411, 417, 421 

 White body, 223 

 White fibers, 99 

 White matter, 327, 328 

 Whitney, D. D., 539 

 Wilson, H. v., 130 

 Wind, 479, 501 



Wings, 62, 63, 273-275, 310, 390, 390-401, 412- 

 413, 445 



bones, 391 

 Winking, 468 

 Wireworms, 285 

 Wolff, Caspar, 554 

 Wolves, 413, 507 

 Woodchuck, 417 

 Woodpeckers, 401, 481, 509 



beak, 399 

 Woodruff, L. L., 70 

 Worker ants, 294 

 Worker bees, 291, 292 

 Worm lizards, 383 

 Worms, 449, 400, 494, 497 



(See various types by name) 

 Wrigglers, 288 

 Wuchereria bancrufti, 181 



X-body, 447 



X-chromosomes, 537, 539-540 

 X-rays, 521, 535 



Y-chromosomes, 537, 539-540 

 Yellowlegs, beak, 399 



foot, 400 

 Yellowthroat, 481 



foot, 400 

 Yerkes, 371 

 Yolk, 109, 110, 116-119, 102, 171, 172, 178, 376 



cells, 162, 171 



circulation, 378 



ducts, 166, 167 



glands, 160, 161, 166, 168, 171, 186 



plug, 371, 372 



sac, 356, 418, 419 



stalk, 378, 419 



Zebra, 506 



Zinc, 19 



Zoaea, 265, 266 



Zona pellucida, 418 



Zooecium, 187, 188 



Zoogeography, 5, 499-509 



Zoology (general), 3-6 



Zoophytes, 143 



Zygote, 45, 88, 89, 94, 447, 528, 537-539 



Zymogen, 97, 98, 404 



