INDEX 



669 



Ulothrix, 69 



structure of, 171 



Ulva, 69 



Umbilical cord, 428 



Undulating membrane, 159 



Unguiculata, 115 



Ungulata, 117 



Ungulates, 487, 514, 534 



Unguligrade feet, 333 



Unit characters, 450 



United States Bureau of Fisheries, 598- 

 599 



United States Department of Agricul- 

 ture, 571, 573, 577, 578, 585, 587 



Urea, 296, 310, 322 



Ureter, 323 



Urethra, 324 



Urochordata, 104, 105 



Urodela, 109 



Use and disuse, 516 



Uvula, 284 



Vaccination, smallpox, 628 



Vaccines, 631-632 



Vacuoles, 129 



Vagina, bee, 212 



Vagus, 318, 352 



Vampire, 508 



Van Helmot, 241 



Van Leeuwenhoek, 151-152, 153 



Vasa efferentia, earthworm, 196 



Vascular rays, ^45-249 



Vas deferens, earthworm, 196 



Vasomotor center, 310 



Variation, 417, 442, 518, 519 



Vaucheria, 69 



Vectors, insect, 618-620 



Veddahs, 561 



Veins, 302, 303, 304, 305 



leaf, 250, 251-^5^ 

 Venereal diseases, 634-635 

 Ventral diaphragm, insect, 210 

 Ventricle, 306, 348, 350, 351 

 Venules, 303 

 Vermis, 350 

 Vesalius, 305 

 Vessels, lymph, 304 

 Vestigial structures, 499, 501 

 Vermiform appendix, 499 

 Vertebrae, 330 



caudal, 330, 331 



cervical, 331 



lumbar, 331 



sacral, 331 



thoarcic, 331 

 Vertebral column, 328, 345 

 Vertebrata, 105 



Vertebrates, 103, 105, 233, 334, 336, 

 532 



Vicuna, 509 

 Villus, 291, 428 

 Vincent, 611 

 Violets, 506 

 Vision, 545 

 Vitamin A, 278 

 Vitamin B, 278 

 Vitamin C, 278 

 Vitamin D, 278, 279 

 Vitamin E, 278 

 Vitamin G, 278 

 Vitamins, 265, 277 



antineuritic, 278 



antipellagric, 278 



antirachitic, 279 



antiscorbutic, 278 



antisterility, 279 

 Vitreous humor, 360 

 Voit, 312 

 Volvox, 67, 179 

 Von Baer, 502 

 Von Bering^ 632-633 

 Von Frisch, 204 

 Von Hohnel, 267 

 Von Mering, 397 

 Von Sachs, 241, 269 

 Vorticella, 77 



Walcott, estimation of geological time 

 by, 553 



Wallace, A. F., 518, 519 



Walter, H. E., 385 



Ward, Henshaw, 486, 529 



Ward, H. B., 10 



Warm receptors, 363 



Warning colors, 492 



Wart hog, 508 



Water 



amount in living things, 133, 254 



rise of, in plants, 269 



role of, in plant life, 255, 256 



Water fleas, 413 



Water vascular systems, 335, 336 



Weapons, 547, 550 



Weaver, 243 



Weed seeds, 40 



Weeds, 40, 519 



Weismann, 517, 523, 526 



Wells 553 



Wells! Huxley, and Wells, 383 



Whale, 117, 490, 498, 499, 514, 521, 

 534, 535, 545 



Wlieat, 454, 573 



Wheat rust, 73, 228 



White matter, 350, 353 



Widal test, 626, 627 



Wiedersheim, 497 



Willughby, 64 



Wings, bee, 206 



