49 
and treatment, and their application to human arts and indus- 
tries. 
^ The specimens have for the most part been gathered from ex- 
hibits made in the Department of Mines and Mining of the 
Columbian Exposition, and were secured to the Museum by the 
Chief of that Department. 
They may be conveniently classified into five groups, which 
can be most readily inspected in the order named: 
Building stones and quarry products, Hall 67. 
Carbon minerals, including coals, petroleum, etc.. Halls 69,. 
70 and 71. 
Ores and products of the precious metals and lead, Hall 72. 
Ores and products of the base metals, Hall 79. 
Clays and sands, Hall 78. 
Salts of the alkalies and alkali earths, Hall 68. 
"1 here are also included in this Division, a Departmental 
Library and Laboratory, and the office of the Curators. 
In tne arrangement of the collections a. series of type speci- 
mens of each group of minerals is placed first. Then follow 
specimens illustrating different localities, arranged in geographi- 
cal order, passing eastward from California. Then are illus- 
trated, so far as the material at hand permits, processes of re- 
duction and finished products showing the uses of the metal or 
mineral. 
HALL 67 . 
MARBLES AND BUILDING STONES. 
This hall contains a collection of the best known foreign 
and domestic marbles in the form of polished slabs. The names 
given on the labels are those by which the stones are commonly 
known, ana in general refer to the color and markings of the 
stone rather than to the composition or the locality where it is 
quarried. 
CASE lA. — “Winooski Marbles,*^ mottled red dolomite 
quarried in the vicinity of Swanton, Vt. 
Other Vermont marbles. 
CASE IB. — Marbles from' Norway and Greece. 
Case 2. — Marbles, France. 
