In this third paper on the ethnology of the Blackfoot Indians, Clark Wissler examines the social culture of the Blackfoot Indians, particularly the Piegan division in Montana. Complete with pictures where appropriate this paper approaches the social life of Blackfoot Indians in a fair and unpretentious manner. Discussions concern marriage, child rearing, naming, games and amusements, government of tribe, picture writing, and other activities specific to the social organization of the Blackfoot Indians. While Clark relied heavily on the first hand knowledge of a Piegan Indian, he supplemented that information with known facts from a variety of sources.