[3] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 619 



Wire silver, from Nevada, Montana, Idaho, and Jfew Mexico. 



Native silver and horn silver, in sandstone, from Utah. 



Horn silver, from Colorado, Utah, Nevada, and New Mexico. 



Ruby silver, from Nevada. 



Base ores carrying silver (milling ores), from Nevada, Utah, and 

 Montana. 



Argentiferous lead ores (smelting ores), from Colorado, Utah, and 

 Nevada. 



Tin. 



On account of recent discoveries and the general interest attaching 

 to tin, the list of the localities of the occurrence of cassiterite, or the 

 binoxide of tin, has been made as comi)lete as possible, and includes 

 Maine, New Hampshire, Virginia, North Carolina, Alabama, Montana, 

 and the Black Hills of Dakota. The tin ore of San Jacinto, Cal., is 

 also shown. 



With the tin ores are shown bars of tin reduced from the New Hamp- 

 shire (1840), Virginia, Alabama, Montana, and California ores; also a 

 collection of Welsh tin-plate. 



Antimony. 



The sulphide ores from Utah (with metal) and California. 



QuicJisilver. 



Cinnabar, from California. 



Leud. 



The sulphide ores from Missouri. (For argentiferous lead ores, see 



under Silver). 



Copper. 



Native copper, from Lake Superior region in Michigan, including — 

 water worn or surface specimens; specimens of the mass copper, and 

 chips obtained in cutting up the masses in the mine ; and specimens 

 showing the disseminated free copper in the rock, both amygdaloid and 

 conglomerate. To these are added specimens illustrating the dressing 

 of the ores. 



Sulphide ores, including the sulphides of copper and iron, from Ver- 

 mont, Maryland, North Carolina, and Missouri, and the sulphide of cop- 

 per from Butte, Montana. 



Oxidized ores, from Pennsylvania, Virginia, and Arizona. 



Bismuth. 

 The oxidized ores from Utah. 



Nickel and cobalt. 

 The sulphide ores from Pennsylvania and Missouri. 



