494 



INDEX 



Water, source of, 347 



table, 360 



vapor of, 42-43 



work under water, 332 

 Waterfalls, 311, 371, 372 

 Water wheels, 311-312 

 Watt, 238-239 

 Weather, Bureau, 382, 384 



conditions, 384 



forecasts, 44 



influence of water upon, 35, 45-46 



maps, 384, 386 

 Weathering of rock, by freezing water, 48 



by oxygen and carbon dioxide, 391- 



392 



by temperature changes, 16-17 

 Wedge, 301 

 Wells, 327, 329 

 Welsbach mantle, 277-278 

 Westerlies, 403 

 Wheel and axle, 304-306 

 Wheelbarrow, 290, 295-296 

 White light, 273 

 Whitewash, 181 

 Wind, 27-28, 35-36, 401-404 



affected by temperature, 27, 402-403 



carrier of moisture, 401 



effect on temperature, 402 



Wind, velocity of, 404 

 Windmills, 309, 312-314 

 Wine, 156 

 Winter, 398-399 

 Wood, as fuel, 118 



distillation of, 64-65 



heating power of, 128 



in making paper, 139 



preservation of, 182 

 Wood alcohol, 64-65 

 Wood tar, 64 

 Wool, 129-131 



bleaching, 161-162 



dyeing, 169 

 Work, 290-293 



definition of, 296 



efficient, 308 



measurement of, 306-307 



rate of, 307 



waste, 308 

 Wounds, 201-202 



Yeast, 153-157 



Yellowstone Park, 371, 416, 417 



Zinc, galvanized iron, 54, 177-178 

 in electric cells, 207-209 

 use in alloys, 179 



