Boas rejected parallel evolutionism, the idea that all societies are on the same path and have reached their specific level of development the same way all other societies have.
鮑亞士也拒斥平行演化論（parallel evolution），這個概念主張所有社會都處在相同的路徑上，並以其他社會都具有的相同方式，達到其特定的發展水平。