Botanist, linguist, ethnologist, and historian of techniques, A.-G. Haudricourt is best known for his seminal articles on the origin of tone in East Asian languages. This volume presents his most important articles, and excerpts from his book on the history of the plow, in English translation, with epilogues on their current relevance. Haudricourt's methodology, applying insights from across the sciences, is a model for researchers.