404 



ELEMENTS OF GENERAL SCIENCE 



Trade winds, belt of, 63, 54 



Transformer, 236*, 240 ; uses of, 237 



Transpiration, 125* 



Transplanting, 326, 327 



Transportation by water, 163-158 



Tubercle bacteria, 314 



Tuberculosis, 95 



Tungsten, 196 



Tungsten lamp, 213* 



Tunnels, 6 



Twins, the, 273 



Typhoid, 95, 100-105 ; bacteria of, 

 100 ; bacteria carried by flies, 105 ; 

 caused by impure water, 160; 

 in the country, 170; death rate 

 from, 102, 160, 161, 165; in United 

 States army and navy, 104 



Unite used in measuring electricity, 



205 



Uranus, 263, 259 

 Ursa Major, 272 

 Uses of electric heating devices, 211- 



212 



Vaccination, anti-typhoid, 103 



Vacuum lamp, 213 



Vapor of water, 21-31, 45-46, 49-65, 



73 



Variation, 884*-385 

 Vega, 276, 277, 278 

 Vegetation and erosion, 307*-308 

 Vegetative reproduction, 373* 

 Veins of leaf, 78 

 Ventricle, 341* 

 Venus, 253, 254 

 Vinegar and bacteria, 95 

 Voltmeters, practical uses of, 206 



Waste material of plants, 82 

 Wastes, disposal of, 171-172 

 Water, amount in atmosphere, 23 ; 

 amount in soil, 294-295; amount 

 used by crops, 296 ; boiling point, 

 114, 115, 116; climatic influence 

 of, 141-151 ; and commerce, 152- 

 158 ; composition of, 66, 70 ; cool- 

 ing of, 147; density of, 140; 

 dissolving rock, 282 ; of earth's 

 surface, 280-281 ; extent of influ- 

 ence, 147-150 ; freezing point, 118, 



114 ; in the house, delivery of, 166, 

 167 ; importance of pure, 100-102, 

 160; impurities in, 160; and land, 

 cause of unequal heating of, 145- 

 147; methods of securing pure, 

 *163-165; pressure of, 128-138; 

 produced by flame, 66; how se- 

 cured by plants, 322 ; and soil 

 temperature, 296-296; and tem- 

 perature, 141 



Water basins and traps, 167* 



Water-carrying tissues, 826 



Water heater, 17*, 18 



Water supply, New York City, 164* ; 

 and sewage disposal, *1 69-1 72 ; 

 sources of, 159-160 



Water table, 298* 



Water vapor, 21-31, 63 



Waterspouts, 61 



Waterways, commercial importance 

 of, 162-164 ; extension and im- 

 provement of, 166-157 



Watt-hour meter, reading of, 208*- 

 210 



Weather, *38~66 



Weather Bureau, the United States, 

 46, 54, 56, 143, 144 



Weather forecasting, 56 



Wells, bacteria in, 170 



West Indies, hurricanes, 49 



Westerly winds, belt of, 61-53 



Wheat, 292 



Wild plants, value of, 318 



Wind, *28-56 



Wind belts, 51-64 



Winds, cyclonic, *42-64 ; trade, 63, 

 64 ; westerly, 63 



Work, *1 73-242; calculated in pul- 

 ley systems, 181-182 ; definition 

 of, 181 ; done by heat, 186-187 ; 

 of freezing water, 281* ; measure- 

 ment of, 181 ; problem in, 177 ; and 

 pulley systems, 180 



World's Columbian Exposition, 216 



Yeast plant, reproduction of, 864* 

 Yeasts, 89*, 91, 96 

 Yellow fever, 112 



Zebu, *386-888 

 Zinc, 69, 140, 268 



