[7] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 623 



The manufacture of gold leaf: Collection from Hastings & Co., Phil- 

 adelphia, Pa. 



Silver. 



The extraction of silver from base ores by chlorodizing roasting, and 

 milling (amalgamation) : Collection from Ontario mill, Park City, Sum- 

 mit County, Utah. 



The smelting of argentiferous lead ores and the refining of the base 

 bullion (silver and lead) : Collection from the Cheltenham Works, Saint 

 Louis County , Missouri. 



The refining of base bullion (silver and lead) : Collection from the 

 works of E. Balbach & Son, Newark, N. J. 



Lead. 



The manufacture of pig lead and white lead direct from the ore : Col- 

 lection from the Lone Elm Works, Joplin, Mo. 



Copper. 



The smelting and refining of copper by the fusion process : Collec- 

 tions from the Baltimore Copper Works, Baltimore, Md., and Saint 

 Genevieve Copper Works, Saint Genevieve, Mo. 



The refining of pig copper : Collection from the Ansonia Brass and 

 Copper Works, Ansonia, Conn. 



The rolling of copper : Collection from the Ansonia Brass and Cop])er 

 Works, Ansonia, Conn. 



Iron. 



The smelting of pig iron : Collections from the Crown Point furnace, 

 Crown Point, N. Y., the Rockwood furnace, Rockwood, Tenn., and the 

 Missouri furnace. Saint Louis, Mo. 



Steel. 



The manufacture of crucible steel : Collection from the Crescent Steel 

 Works, Pittsburgh, Pa. 



The manufacture of Bessemer steel: Collection from the South Chi- 

 cago Bessemer Works, South Chicago, 111. 



Zinc. 



The smelting of spelter or zinc: Collections from the Glendale Zinc 

 Works, Saint Louis, Mo., the Joplin Zinc Works, Joplin, Mo., and the 

 Rich Hill Zinc Works, Rich Hill, Mo. 



Zinc, iron, and manganese. 



The smelting of spelter or zinc, oxide of zinc, and spiegeleisen from 

 Franklin, N. J., ores: Collection from the Passaic Zinc Works, Jersey 

 City, N. J. 



