484 



INDEX 



Wells, pollution of, 78 



Wheat, 271 



Wheel and axle, 174, 179 



Whirlwind, 246, 248 



White lead, 203 



Wind, 22, 57, 233, 245, 246 



Windmill, 185 



Wind, use of, 183, 184, 185 



Wood, 116,291,294 



Wood alcohol, 116, 117 



Work, 24, 25 



chemical, 164 

 Worms, 317 



Yard, 7 



Yellow fever, 449 

 Yeast, 1.19, 188 

 Yeast plant, 303 



Zenith, 159 



