 He endeavored to establish a discipline that would base its claims on a rigorous empirical study.One of Boas's most important books, "The Mind of Primitive Man" (1911), integrated his theories concerning the history and development of cultures and established a program that would dominate American anthropology for the next fifteen years.In this study, he established that in any given population, biology, language, material, and symbolic culture, are autonomous; that each is an equally important dimension of human nature, but that no one of these dimensions is reducible to another.