INDEX 



463 



Underwings, 63 



Unfit, elimination of, 183 



Ungulata, 417-419, 435 



Unit character, 177 



United States Bureau of Fisheries, 



204, 327, 446 

 Ureters, 316, 409 

 Urethra, 409 

 Uric acid, 123, 193 

 Urine, 125 



Urinogenital opening, 316 

 Urodela, 344 

 Urostyle, 338 



Vaccination, 431 



Vacuoles, 290 ; contractile, 290 ; food, 



290 

 Vampire, 427 

 Vane, 369 

 Variation, 173 

 Varieties, 108, 401 

 Ventral sinus, 8 



Ventricle, 194, 206, 313, 334, 352, 372 

 Vertebra?, 316 

 Vertebral column, 316 

 Vertebrates, 299, 309 

 Vibrissa?, 404 

 Vireonidae, 392 

 Vireos, 392 

 Vitamins, 125 

 Vries, Hugo de, 177, 188 

 Vultures, 387 



Walking leaves, 21 



Walking sticks, 20 



Walruses, 424 



Walton, Izaak, 328; on perch, 318 



Walton, Izaak, League, 447 



Warblers, 392 



Warning coloration, 48, 49, 58, 345 



Wasps, 77 ; digger, 80 ; paper-making, 

 79 ; potter, 82 ; social, 77 ; solitary, 79 

 Water beetles, 46 

 Water boatman, 41 

 Water bugs, 41 ; giant, 42 

 Water dog, 347 

 Water fleas, 165 

 Water moccasin, 359 

 Water snakes, 361 

 Water-vascular system, 224 

 Wax of bees, 86 * 

 Wax pockets, 86 

 Weevil, cotton boll, 51 

 Whalebone, 417, 430 

 Whales, 416 

 Wheel animalcules, 308 

 Whip scorpions, 144 

 Whirligig beetles, 46 

 White ants, 110 

 White grubs, 44 

 Wild-life sanctuaries, 432 

 Wilson, E. B., 448 

 Wireworms, 49 

 Wolves, 423 

 Wood tick, 143 

 Wood-boring beetles, 52 

 Woodchuck, 422, 432 

 Woodcock, 385 

 Woodpeckers, 389 



Woodruff, L. L., on Paramecium, 295 

 Workers, 78, 83 

 Wrigglers, 74 



Yellow fever, 74, 102, 103 



Yerkes, R. M., on intelligence in 



frogs, 342 ; on apes, 430 

 Yucca moth, 105 



Zoological history, 442 

 Zoology, 441 



