894 Index 



Vasa efferentia, 371,* 440, 513 

 Vascular bundle, 133-148, 145,* 147,* 

 191-198 {see also Tissues) 



Vegetal pole, 445,* 452 

 Vegetation areas of North America, 

 599-602, 599* 



Veins, 311,* 312,* 400 

 of frog, 430, 431,* 433 

 of leaves, 145,* 147,* 210-215, 224 

 of man, 470,* 477-489, 740,* 741* 



Velum, 288,* 289, 310,* 328,* 400, 

 401* 



Vena cava, 431, 478*-481,* 480-489, 

 488,* 493,* 741* 



Venter, 186, 187, 197, 202 



Ventral horn, 55* 



Ventricle, 311,* 312,* 331-340, 332,* 

 340,* 430, 430,* 431, 456,* 

 470,* 477, 478*-480,* 495,* 

 503, 504, 740* 



Venus's flower basket (sponge), 281 

 Venus's-flytrap (plant), 106, 636, 668* 

 Vermiform appendix, 863 

 Vertebral column, 329-343, 423, 423,* 

 424, 449* 



Vertebrata (vertebrates), 329-343, 

 340,* 421-441 



Vertebrate brains, 743* 



embrvos, 738* 



heart^ chambers, 331-340, 740,* 741* 

 VesaHus, 801 

 Vesicle, 306,* 452 

 Vestibule, 505 



Vestigial structure, 516, 744 

 Vigor, hybrid, 705 

 Villus (vilH), 451,* 453, 475 

 Vinegar eel (Turbatrix), 295, 296,* 

 298, 539 



Viosterol (see Vitamins) 

 Virus, 789-790 

 Visceral, 311* 

 Vision, 398 (see also Eye) 

 Vitalism, 863 



Vitamins, 90, 169, 176, 474, 475, 486, 

 487, 769-772, 769*-771* 



Vitelline, 455 



Vitreous body, 497,* 505 



Viviparous, 863 



Vocal fold (vocal cord), 469,* 492 



sac, 427* 

 Volutin, 160 



Volvox, 274, 360-363, 361,* 362,* 535 

 Vomerine, 424 

 von Mohl, 37 



Vorticella, 278,* 279 {see also Pro- 

 tozoa) 

 de Vries, 676, 684 



W 



Walking stick, 554, 730 {see also In- 

 sects) 



Wallace, 803 



Warm blooded, 340-343 



Wasps, 319 {see also Insects) 



Waste elimination, 100, 106, 390, 435, 



492-494, 633 {see also specific 



organisms) 



Water, 90, 226, 228, 235, 492-494, 629- 

 633 



"bloom," 114, 152, 249 



farming, 776 



flea, 318, 324* 



mold-, 173, 174* (see also Sapro- 

 legnia) 



molecule of, 83* 



silk, 157 



storage, 187, 188 



supply, 781-783 



vascular system, 302* 

 Wax, 404 



Wealth and biology, 779 

 Web of life, 655 



toe, heredity, 716* 

 Weevil {see Insects) 

 Weigert, 804 

 Weismann, 706, 803 

 Welfare and biology, 778 



and heredity, 693 

 Wheat rust (Puccinia), 129, 181-183, 

 182* 



Wheel organ, 298 



Whelk, 310 



White "ant" (termite) {see Insects) 



corpuscle (leucocyte) {see Tissues, 

 blood) 



matter, 55,* 503, 505 



Whitefish embryo, 64* 

 Whorl, 194 

 Why study biology, 17 

 Willstatter, 233 {see also Photosynthe- 

 sis) 



Wilson, 29 

 Windpipe, 434 



Wings, 140,* 144,* 202, 203, 212, 318, 

 340, 393, 400, 414-418 



Wollaston, 30 



Wood, 145,* 201-203, 207, 214, 220, 

 258, 261 



Wooden tongue of cattle, 789 

 Worker honeybee, 399, 399* {see also 

 Honeybee) 



Working hypothesis, 22 

 Wormian bone, 466 



Wuchereria (filaria), 297, 297,* 298, 

 785 



