Evolution in Folklore: Some West African Prototypes of the "Uncle Remus" Stories by A. B. Ellis (1895). This is an article in Appletons' Popular Science Monthly, vol. 48 (1895-1896): pp. 93-104. The article is available at Wikisource.
Plantation Folklore by Thomas F. Crane (1881). This is an article in Appletons' Popular Science Monthly, vol. 18 (1881): pp. 824-832. The article is available at Wikisource.