The Collection of Minerals. 
A Guide Leaflet to the Exhibition Halls 
of the 
Department of Mineralogy 
in the 
American Museum of Natural History. 
By 
LOUIS P. GRATACAP, A.M., 
Curator of Mineralogy. 
GUIDE LEAFLET, No. 4. 
SUPPLEMENT TO THE AMERICAN MUSEUM JOURNAL, 
VoLuME II, No. 2, FEBRUARY, 1902. 
New York: Published by the Museum. 
Second Edition, Revised, May, 1904. 
