71 
Wales, Australia. Assays silver, 58*02. per ton; lead, 72 per cent 
Olyect Q.— Copper-silver ore, Leadville, Colorado. Assay?; 
silver, 41 oz. per ton; copper, 1 8 per cent. 
Objet R.— Zincdead ore. Laurium, Greece. 
Object S. — Gold and silver ore from the State of Washing- 
ton, and other specimens from American localities. Silver, lead, 
and copper ore from the Cordillera Hill, Silver Mine, Peelwood, 
New South Wales, Australia. 
Object U. — Gold and silver ore. British Columbia. 
HALLS 73, 74, AND 75. 
Hall 73. — Offices of the Divisions of Systematic and Eco- 
nomic Geology. 
Hall 7 4:. — Reference Library for Systematic and Economic 
Geology. 
Hall 75. — Assay Office and Laboratory. 
