ADYERTISEME^^T. 



This memoir, with others referred to in the text, relating to the Delta of the 

 Mississippi, and adjacent regions, is the result of a series of investigations 

 commenced at the expense and made under the direction of the Smithsonian 

 Institution by Professor E. W. Hilgard, with assistance contribufed by the New 

 Orleans Academy of Sciences, and the Commissioners of Immigration for the 

 State of Louisiana. 



JOSEPH HENRY, 



Secretary S, I. 

 Washington, June, 1872. 



(iii) 



