INDEX 



493 



Toaster, electric, 212 



Tonics, 195 

 Trade winds, 403 

 Transpiration, 443-444 

 Traveling crane, 306 

 Trees, conifers, 454-455 



deciduous, 455-456 



injury to, 451-452 



protection of, 331, 443, 446-447 



relation to floods, 345-346 



transpiration of, 443-444 

 Trichinae, 89, 90 

 Trolley cars, 231-233 

 Trombone, 287 

 Trumpet, 287 

 Tuberculosis, 196, 198 

 Turbine, 315 

 Turkey, 464, 465 

 Turpentine, as disinfectant, 2OI 



commercial products of, 458 



distillation of, 41 



in varnish, 184 



to remove paint spots, 147 

 Typewriter, 307 

 Typhoid fever, bacteria, 198 



summer vacation, 328-329 



water supply, 340-341 



Ultramarine blue, 164 

 Uncompahgre project, 355-356 

 Unleavened bread, 154 

 U. S. Fisheries Bureau, 468-469 

 U. S. Weather Bureau, 382, 384 



Vacuum bottle, 32 



Valleys, 367-370 



Vanilla extract, 102 



Vapor, of gasoline-naphtha, 317318 



of water in the atmosphere, 42-43 

 Varnish, 184-185 



prevents rust, 54 

 Vaseline, 126 

 Vegetable dyes, 138, 168-169 



in foods, 103-104 

 Vegetables, canning of, 114-115 



Vegetables, cooking of, 87-89 



water in, 73 

 Vegetation, and rainfall, 348-352 



in deserts, 350-352- 

 Veins, in leaf, 447-448 



in rock, 361 

 Ventilation, amount per person, 27, 59 



methods of, 59 



to remove moisture in, 44 

 Vertebrates, 469 

 Vinegar, 98-99 



as food preservative, 113 

 Violin, 285 

 Volcanoes, 411-415 

 Volt, 209 

 Voltaic cell, 207-209 



Washing powders, 144-146 



Washing soda, 145, 150 



Water, amount necessary per person, 



313 



boiling point of, 19, 37 

 city supply of, 334-340 

 composition of, 344 

 condensation of, 39 

 constructive action of, 361-362 

 contamination of, 326, 340-344 

 distillation of, 40-41 

 erosion by, 362-364 

 expansion of, 13-14 

 filtration of, 326, 342-343 

 formation of fans and deltas, 365-366 

 freezing of, 46, 48 

 hard and soft, 144-145 

 heavier than ice, 47 

 influence on weather, 35, 45-46 

 in food, 73-74 



irrigation, 324-325. 353~356 

 mineral matter in, 357-358 

 precipitation of, 361-362 

 purification of, 341-343 

 purity of, 203 



rainfall, 42, 347~353 4<> 4OI 

 required by body, 73 

 solvent action of, 357-359 



