INDEX — GLOSSARY. 



459 



Vertebrates, locomotion in, 413 



nervous system of, 444 



reproduction in, 506 



segmentation of, 336 



sense of smell of, 370 

 of taste of, 370 

 organs of, 362 

 Vessels (of plants), 74 

 Vestigeal organs, 794- 

 Vibrio, 227 

 Villi, 472 

 Visceral sac, 595 

 Vision, 383, 384 

 Vitreous humor, 382 

 Viverridae, 663 

 Voice, 396 

 Volvocales, 239 

 Vultures, 650 



Walking stick insect, 265 



Walrus, 664 



Warblers, 650 



Warm blooded animals, 840 



Wasps, 590 



care of young, 855 

 Water and vegetation, 183-195 



boatmen, 591 



bugs, 591 



striders, 591, 763, 766 



vapor, transpiration of, 84 

 Weasel, 663 

 Web of spider, 569 

 Whales, 652, 665 

 Whale bone, 250, 347 



rudimentary limbs of, 795 

 Wheat rust, 749 

 "White ants" — termites, 583 

 White blood-corpuscles — leucocytes, 



494, 776 

 Numbers refer to paragraphs; Black 



Whip-poor-will, 650 

 Whorl — three or more leaves, or other 

 parts, set around the same 

 node. 

 "Witches broom," 261 

 Wolves, 663 

 Wood lice, 561, 563 



pecker, 650 

 Worker (ants or termites), 583 

 Worms, 349, 542_ 



connective-tissue of, 416 



digestion in, 455-457, 466 



eyes of, 376 



glands of, 349 



integument of, 340 



nephridia of, 490 



sense organs of. See nereis. 



sensitiveness to light, 376 



Xerophytes, 183, 193-195 

 Xiphosura, 565 



Xylem, the wood portion of a vascular 

 bundle. 



Yeast, 262 



Yolk, effect on cleavage, 711 

 Young, care of, 854 

 Yucca, 852 



pollination of, 257, 258 



Zooglea, 228 

 Zygnemaceas, 236 

 Zygomycetes, 250 



Zygospore, a spore formed by the 

 fusion of two similar gametes, 



234 

 Zygote, a body formed by the fusion of 



two gametes. 

 Face numbers refer to figures. 



