448 



INDEX 



Vaccination, 274, 275, 407. 

 Vaccines, 276; 



work of Pasteur, 409. 

 Vacuoles, 45, 46. 

 Valves, in heart, 170; 



in veins, 173. 

 Variation, 381 ; 



continuous and discontinuous, 385; 



Darwin's theory, 383, 384. 

 Vaucheria, reproduction, 223, 224. 

 Vegetables, canned, 343, 344; 



garden, 328; 



value as food, 123, 130, 132. 

 Vegetative propagation, 220, 221. 

 Veins, 169, 172, 173. 

 Venae cavse, 172. 

 Ventilation, 183, 184, 185. 

 Ventricle, 169, 170. 

 Venus's flytrap, 92. 

 Vermiform appendix, 159. 

 Vertebral column, 243. 

 Vertebrata, classified, 243-250. 

 Vertebrates, classified, 243-250. 

 Vesture, of insect, 25. 

 VilH, 157, 158. 

 Vinegar, 340. 

 Virginia creeper, 331. 

 Vitamins, 119, 121-123, 124; 



table of, 122. 

 Vocation, choice of, 402-403. 

 Voit, cited, 132. 

 Voluntary acts, 202. 

 Von Behring, work on antitoxin, 272. 

 Vorticella, 238. 

 Vries, Hugo de, 385, 413. 



Wallace, Alfred Russel, biologist, 412. 

 Wastes, disposal of, 296-297. 

 Water, composition, 8, 9; 

 food of man, 121, 124; 



Water, influence on living things, 16 ; 



source of disease infection, 264, 265, 

 303-305; 



supply, 296, 303, 304. 

 Weeds, characteristics, 13, 14, 332- 

 333; 



checked by animals, 357, 360, 361 ; 



harm done bv, 332-333. 

 Weevils, 28, 363, 364. 

 Weissman, August, biologist, 412, 

 Whale, 348, 355. 

 Wheat, 325, 327, 328 ; 



bearded and beardless, 385 ; 



value as food, 121. 

 Wheat rust, 337. 

 Whooping cough, 264, 269. 

 Widal test, 165, 275. 

 Wind, pollination by, 39. 

 Windpipe, 150, 178. 

 Winslow, Dr. C. E. A., quoted, 308. 

 Wood, 87, 88; 



uses of, 316, 317, 369. 

 Woolen industry, 354. 

 Worms, 240, 241 ; 



parasites, 287-290. 

 Wrens, 376. 



Xeropthalmia, 123. 

 Xylem, 91. 



Yeast, 338, 339; 



reproduction, 222, 223. 



value as food, 123. 

 Yeast cakes, 338. 

 Yellow fever, 281, 282. 

 Yucca, polhnation, 37-38. 



Zygospores, 223. 

 Zygotes, 223. 

 Zymases, 338. 



