SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE. 



248 



ON THE 



GEOLOGY OF LOWER LOUISIANA 



SALT DEPOSIT ON PETITE ANSE ISLAND. 



BY 



EUGENE W. HILGARD, Ph.D., 



PROP. OP CDEMISTRY, UNIVERSITY OP MISSISSIPPI. 



[accepted for PU BL IC at ion, OCTOBER, 1871.] 



