INDEX 



363 



power, 176-180. 



precipitates, 72, 73. 



pressure, 208-211, 214-216. 



purification, 77. 



rain, 225. 



running, value of, 178-180. 



source of, 78. 



steam, 32. 



waves, 145-147. 



weight, 208-209, 215. 



wells, 195-201. 



wheels, 176-180. 



work under, 203-205. 

 Water supply, and forests, 216-217. 



cost, 212-214. 



of city, 206-212, 217. 

 Watt, 351. 

 Waves, heat, 145-147. 



light, 145-147. 



sound, 268, 272-274. 



water, 145-147. 

 Weather, bureau, 87-91. 



forecasts, 38-39, 86-88. 



relation of water to, 29, 40.. 

 Weather maps, 89-91. 

 Wedge, and inclined plane, 166. 

 Weight, of air, 86. 



of water, 208-209, 215. 

 Welding, by electricity, 315. 

 Wells, 195-201. 



drilled, 199. 



driven, 196-197. 



Wheel and axle, 169-171. 



cogwheels, 170. 



windlass, 169. 



Wheelbarrow as lever, 160-161. 

 White light, nature of, 135. 

 Wind instruments, 297-301. 

 Windlass, 169. 

 Windmill, 174-175, 180-182. 

 Winds, 24. 

 Wine, 232, 234. 

 Wood, as source of charcoal, 58. 



ashes in soap making, 223. 



in paper making, 219. 



preservation, 253-254. 

 Wool, bleaching, 241. 



dyeing, 245-247. 

 Work, 156-186. 



and steam, 183-184. 



and water, 176-180. 



conservation, 174-175. 



formula, 157. 



machines, 157-175. 



unit of, 172-173. 



waste, 173. 

 Woven designs in cloth, 249. 



Yeast, 234-236. 

 wild, 235-236. 



Zinc, in galvanizing iron, 49. 

 in making hydrogen, 80. 

 in voltaic cell, 307-308. 



