The Excluded Third: Contribution to a Dialectical Anthropology is a wide-ranging study of the relationship between biology and the Humanities.

In this book, Fernando Haddad responds to the new forays from biology into the Humanities by pointing out the inconsistencies of the theory of evolution in addressing cultural dynamics. He suggests an alternative approach which resumes the dialogue between anthropology and historical materialism. Through this encounter, Haddad argues, dialectics reintroduces itself to anthropology from a different perspective, and the role of symbolic language within materialism is re-evaluated.