432 



INDEX 



Tidal air, 334. 



Timber, methods of cutting, 111. 



Tissue ceUs, 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. 

 VegetablQ. fibers and oils, 127. 

 Veins, 318 ; 



function and structure, 323 ; 



valves, 324. 

 VenaB cavse, 322. 

 Ventilation, 335, 338. 

 Ventricle, 319 ; 



of fish heart, 236. 

 Venus fly trap, 102. 

 Vermiform appendix, 309. 

 Vertebral column, 186. 

 Vertebrates, breathing of, 232. 

 Villi, 308. 



Virginia creeper, 128. 

 Virus, 392. 

 Vitreous humor, 361. 

 Vorticella, 171, 178. 

 Vries, Hugo- de, 253, 406. 



Warner, Chas. Dudley, 21 1. 

 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 ceUs, 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. 



