674 REPORT OF NATIONAL MUSEUM, 1891. 



228. Smelting Furnaces, etc. 



Furnaces and smelting plant nf all kinds. 



229. Bessemer Plant, etc. 



Note. — A place is also assigned to mining and metallurgical machinery in connec- 

 tion with the general machinery exhibit. It may he installed in either place, but 

 would probably Ije more instructive here. 



23. The Principal Mining Industries. Special Monographic Exhibits. 



231. Gold Mining. 



Stream-bed and placer working. 



Lode working. 



Monographic exhibit — Tool, methods, miners and results. 



Extraction of free gold from auriferous gravel by amalgauiation, and from 

 auriferous pyrite in quartz by stamping and amalgamating. 



Extraction of gold from auriferous mispickle (arsenical pyrites) by roast- 

 ing and chlorination. 



Extraction of gold and copper from auriferous copper ores by the fusion 

 and electrolytic process. 



The manufacture of gold leaf. 



232. Silver Mining. 



Extraction of silver from base ores by clilorodizing, roasting, and milling 

 (amalgamation ) . 



Smelting of argentiferous lead ores and the retining of the base bullion (sil- 

 ver and lead). 



The refining of base bullion (silver and lead). 



233. Ikon and Steel. 



Monographic exhibit. 



234. Copper. 



Native copper, sulphide ores, oxidized ores. 

 Smelting find refining of copper by the fusion process. 

 Refining of pig copper. 

 Rolling of copper. 



235. Diamonds and Precious Stones in General. 



236. Lead, Quicksilver, Antimony, Tin, Nickei,, Arsenic, Bismuth, Cadmium 



and Cobalt, etc. 



237. Zinc. 



238. Barites, Feldspar, etc. 



239. Other Industries. 



24. Quarrying and Stone Working. 



240. History of the Use of Stone. 



Early quarries and stone masonry. Literature. Folk-lore. 



241. History and Statistics of Quarries and Building Stone. 



Prices, past and present. Markets and traffic. 



Comparative use of stone and other materials, past and present, and in vari- 

 ous localities. 

 Social and economic condition of operatives. 



242. Granite, Gneiss, Porphyry, etc. 



243. Marble and Limestone. 



244. Sandstone, Freestone, and other Massive Building Stones. 



245. Slates for Roofing, etc., and the other Flagging and Sheathing 



Stones. 



246. Building Stone, Marbles, Slates, etc. 



Rough hewn, sawed or polished, for buildings, biidges, walls, or other con- 

 etruction, or for interior decoration. 



