This book contains a series of fourteen papers delivered at one of the Biology and Behavior conferences organized by Russell Sage Foundation and The Rockefeller University. The topics include discussions of the relationship between genetics and intelligence; behavior genetics research in infrahuman species and its relevance for understanding human social behavior; the role of social competition in natural selection, with particular attention to population control; and biogenetic theories of social structure and process, such as stratification, socialization, deviance, and social change.