VII-CIRCULARS OF THE U. S. NATIONAL MUSEUM. 



C 51 Circular to accompanv collections illustrating- rock-weatherui^ 

 and soil-formation which have been prepared l)y the Department 

 of Geolog-y, U. S. National Museum, under direction ot Dr. 

 George P. Merrill, head curator. 



pp. 1-3. 29 



