KEI'OKT OF DJfiFAKTMENT OF METALLURGY, 241 



ing of auriferous and argentiferous copper ores from the Colorado 

 Smelter. 



The following collection* were obtained, upon solicitation of the cu- 

 rator, for the New Orleans Exposition: 



a collection representing the extraction of gold from the auriferous 

 gravel of California by the hydraulic process. Collected by Mr. W. II. 

 Radford. 



a collection representing the extraction of gold from auriferous pj 1 ite 

 from the Bobtail Mill, Black Hawk, Colo. Collected by E. M. Rogers* 



A collection representing the delicate manipulation required in the 

 manufacture of gold leaf. Presented by Eastings & < 'o.,of Philadelphia, 

 Pa, 



A very large and extensive collection of the ores of Utah. Presented 

 m exchange by Prof. J. E. Clayton, Salt Lake City, Utah. This col- 

 lectioo is especially valuable as ailing in many gaps of our permanent 

 eollections, and also supplying some ores which are only found iu Utah. 



Colleetions representing some of the recently discovered tin ores of 

 the country. From Virginia, presented by the Cash Mining Company; 

 from Alabama, presented by Dr. George W. Gessner ; and from Dakota, 

 presented by Prof. George W. Maynard. 



A eollection representing the process of manufacture of white lead 

 and other lead paints. Presented by Harrison Brothers & Co., of Phil- 

 adelphia, Pa. 



A very large and interesting collection representing the manufacture 

 of copper into various commercial forms, the manufacture and utiliza- 

 tion of brass, and the process of wire-drawing. Presented by the Au- 

 souia Brass and Copper Works, Ansouia, Conn. 



A collection representing the smelting and refining of copper from 

 various sulphureted ores. Presented by Pope, Cole & Co., Baltimore, 

 Md. 



A collection representing the refining of native copper separated from 

 the ores of the Mass .Mine, Lake Superior. Presented by C. G. Hussey 

 & Co., Pittsburgh, Pa. 



A collection representing the smelting of pig-iron from fossiliferous 

 ores at Bock wood, Tenu. Presented by the Koane Iron Company, Chat- 

 tanooga, Tenn. 



A collection representing the smelting of pig-iron from brown ores 

 in Virginia. Presented by the Lougdale Iron Company, Longdate, Va. 



A collection representing the very interesting and intricate process of 

 the manufacture of crucible steel. Presented by Miller, Metcalf & 

 Parkin, Pittsburgh, Pa. K 



A very interesting collection representing various processes of iron 

 and steel manufacture in Sweden, together with descriptions of t he proc- 

 esses. Presented by X. Lilienberg, New York. 



A Large collection of the zinc ores from the Bertha mine. Presented 

 by Thomas .Jones, Pulaski, Va. 

 S. Mi.. 33, pt. L> 10 



