INDEX 289 



Water, erosion, 25-27 Weather, atmospheric movements, 



extent, 8 179 



filtered, 44 forecasts, 178 



ground- water, 31 maps, 182 



hard, 44 Weather Bureau, 182 



irrigation, 80 Weight, 120-121 



material dissolved, 44 Wells, 32, 46, 52, 53 



refraction of light in, 223 artesian, 33, 52 



soft, 44 oil, 53 



supply, 85 Windlass, 55 



suspension in, 44 Winds, 3, 178-188 

 Water-meters, 68 basic directions, 186 

 Water-power, 70, 71, 72, 74, 77 "~ convection currents, 182 

 Water-pressure, 63, 64, 65, 66 = "JjJ ' 

 Water-table, 32 _ moveme nts of, 179 

 Water-works, 66, 67 _ p i an etary, 187 

 Waves, color, 220 prevailing, 186 



length, 218 trade, 182 



light, 219 



sound, 218 Zenith, 172 



water, 218 Zones, 174-177 

 Weather, 178-188 Zoology, 270 



