432 



INDEX 



Tidal air, 334. 



Timber, methods of cutting, 111. 



Tissue cells, 49, 179. 



Toad, use of, 209. 



Tobacco and circulation, 328 ; 



and respiration, 346 ; 



users of, 293. 

 Tortoise, 188. 

 Touch, 357. 

 Tourniquet, 326. 

 Toxin, 152, 316. 

 Trachea, 185. 

 Transpiration, 85,. 87. 

 Transportation of lumber, 110, 111. 

 Treatment of cuts and bruises, 



326. 

 Trees, need of city, 115 ; 



preventing erosion, 108 ; 



regulate water supply, 105 ; 



value of, 105. 

 Trichina, 228. 

 Trichinosis, 228. 

 Trillium, 175. 

 Trout, development, 238. 

 Trypanosomes, 221. 

 Tuberculosis, 152, 153; 



and milk, 381 ; 



how to fight, 393, 394. 

 Tussock moth, 215. 

 Twig, section of, 98. 

 Tympanic membrane, 358. 

 Tympanum of frog, 242. 

 Tyndall box, 399. 

 Typhoid, 224, 385; 



and diarrhea, 200. 

 Typhoid fever, 152, 155, 382. 



Unit characters, 258. 

 Ureter, 342. 

 Urethra, 342. 

 Urine, 341. 

 Urodela, 188. 

 Uses, of animals, 198 ; 



of antibodies, 316 ; 



of green plants, 117 ; 



of ice, 377 ; 



of nutrients, 274 ; 



of protozoa, 172. 

 Uterus of a mammal, 247. 



Vaccination, 157, 221, 391. 

 Vacuoles, contracting, 168. 

 Value, of insects, 208 ; 



of trees, 105. 

 Valves, 185, 319 ; 



in vein, 324. 

 Variation, 250. 

 Vasomotor nerves, 325. 

 Vegetable fibers and oils, 127. 

 Veins, 318 ; 



function and structure, 323 ; 



valves, 324. 

 Venae cavae, 322. 

 Ventilation, 335, 338. 

 Ventricle, 319 ; 



of fish heart, 236. 

 Venus fly trap, 102. 

 Vermiform appendix, 309. 

 Vertebral column, 183. 

 Vertebrates, breathing of, 232. 

 Villi, 308. 



Virginia creeper, 128. 

 Virus, 392. 

 Vitreous humor, 361. 

 Vorticella, 171, 178. 

 Vries, Hugo de, 253, 403. 



Warner, Chas. Dudley, 211. 

 Waste of food, 287. 

 Water, 275 ; 



composition of, 20 ; 



impure, 289 ; 



supply, 383. 

 Weed, 48, 128. 

 Weights, 417. 

 Wheat crop, 121, 122. 

 Wild orchid, 40. 

 Windpipe, 300, 301. 

 Wood, uses of, 110. 

 Work of cells, 270 ; 



of Department of Agriculture, 255 



relation to diet, 277. 

 Worms, 183. 



Yeasts, 136, 138, 139 ; 



relation to man, 135. 

 Yellow fever mosquito, 219. 

 Yucca, 42, 43. 



Zygospore, 174. 



