430 



Wood, uses of, 432. 

 Woody fibre, 429. 

 Wrought iron, 342. 



y. 



Yeast, 538. 



INDEX. 



Z. 



Zaffre, 348. 

 Zinc chloride, 333. 

 Zinc, production of, 331, 

 Zinc, uses of, 334. 



THE END. 



