A comprehensive ethnographic sketch defines the Siouan stock, outlines its geographic and linguistic range, and traces affinities between plains and eastern groups. It surveys tribal nomenclature and principal cultural traits, describes phonetic and graphic arts alongside industrial and aesthetic productions, and examines social institutions, belief systems, and the development of mythology. The work treats physical characteristics, habitat and settlement patterns, political and kinship organization, and historical movements, using case studies of several tribes to illustrate both variation and common features. Analysis combines linguistic comparison, ethnographic description, and historical reconstruction to present an integrated portrait of the peoples treated.