REPORT OF DEPARTMENT OF METALLURGY. 253 



its at Haruey Peak, iii the Black Hills of Dakota. In 1884 a further dis- 

 covery was made at King's Mountain, North Carolina. All the latter lo- 

 calities were not i)reviously represented in the Museum, and in order to 

 make the series as full andcomi)leteasi)ossible a special effort was made 

 to complete the representations. With one exception this has been en- 

 tirely successful. The new collections were received from Maine, Vir- 

 ginia, North Carolina, and the Black Hills. In the latter case, however, 

 the representations are not at all complete, but a full series has been 

 promised the Museum by the owner of the Etta, which is the principal 

 mine of the region. 



A complete series of tin plate of Welsh manufacture was presented 

 to the Museum by Merchant & Co., of Philadelphia. This shows plates 

 of charcoal iron, coke iron, and Bessemer steel coated with various 

 thicknesses of tin, giving the different grades and varieties for different 

 uses. 



Antimony. — The occurrence of antimony in this country in workable 

 deposits is somewhat limited. The ores of Kern County, California, 

 were partially represented in the Centennial material, but some addi- 

 tions are desirable. New material from the Utah locality was obtained 

 from Professor Clayton. This represents the ore in several varieties, 

 including the very pure and unaltered stibnite and its oxydation pro- 

 ducts, together with the metal smelted from it. The very interesting 

 and promising deposits of Southwestern Arkansas are not represented 

 in the Museum, but it is hoped that a suitable series of specimens from 

 that region can be obtained at the close of the New Orleans exposition. 



Lead. — The extraction of lead alone is somewhat limited, owing to the 

 fact that so much lead is produced from the refining of the argentiferous 

 leads of the Western countries; the adv^antage gained by the presence of 

 a small amount of silver in the ore being so great that non-argentiferous 

 ores for the most part cannot bo smelted except under the most favor- 

 able conditions. The Missouri lead region is still able to compete with 

 this argentiferous material, however, and the processes followed have 

 been very fully illustrated. The collections include two series from the 

 Saint Joe and Desloge Works, at Bonne Terre, Mo., collected by Mr. J.F. 

 Kemp. These collections are especially interesting from the large num- 

 ber of specimens they contain illustrating the process of the mechanical 

 dressing or concentration of the ore. The galena occurs disseminated 

 through a magnesian limestone or dolomite, and the process of concen- 

 trating this galena mechanically has been brought to a high state of 

 perfection. Besides these dressed specimens the collections include the 

 fuels and fluxes, the pig-lead produced, together with the matte and 

 slag, the skimmings from the refiner and the refined pig. An entirely 

 similar collection from Mine La Motte, Mo., was made by Mr. Gazzam. 

 This collection, however, has farther value and interest from the occur- 

 rence of nickel and cobult in the Mine La Motte ores. 



One of the most interesting of metallurgical operations is carried on 



