620 



Index 



Water, decomposition of, 115 ff., 118 

 energy of falling, 233 ff., 243 ff., 



246 ff., 249 



hard, 196, 223 ff., 547, 548, 557 

 heat capacity, 101 

 level of ground, 194 ff. 

 plant's use of, 463 ff. 

 power, 233 ff., 248 

 cost of, 235 

 neglect of, 235, 271 

 pressure, 201, 225 ff., 341 



transmission of, 229, 341 

 solvent power of, 135, 196, 411 ff., 



415, 459 

 supply, 188 ff. 



and disease, 187, 198, 206 ff., 



210, 225 



and sewage disposal, 210 ff., 225 

 control of, 187, 223 

 transportation on, 337 ff. 

 trap, 213 



underground, 196, 466 ff. 

 uses of, 98 ff., 100, 186 ff., 230, 



234 ff., 248, 305 ff. 

 wheels, 238 ff . 

 Water-gas, 119, 162 

 Waterspout, 36 ff., 41 

 Weather, 1 ff. 



Weather Bureau, the United States, 4, 5 

 forecast, 2, 54 



Weather Bureau, map reading, 10 

 Wells, deep, 194 



shallow, 198 ff. 

 Welsbach mantle, 160 ff. 

 Wheat, improvement of, 512 



grain, constituents of, 521 

 Winds, 19 ff., 31, 64, 111 



direction of, 3, 19 ff. 



local, 22 



planetary, 102 



velocity of, 3, 22 ff., 31 

 Wiring a house, 172 

 Wood, composition and heat value of, 

 144 



distillation of, 128 



properties and use, 342 ff., 404 ff. 

 Work, measurement of, 244 ff., 268 ff. 



of steam, 311 ff. 

 Wright brothers and the airplane, 395, 



401 

 Wrought iron, 449 



Yeasts, 551, 558 ff., 563 ff., 568 ff. 



distribution of, 565 ff., 568 



uses of, 560, 565 ff., 569 

 Yellow fever, 532 ff., 543 



Zero, 86, 87 



absolute, 88, 90, 311, 392 

 Zinc, 119 



Printed in the United States of America. 



