Eugenio Bulygin is a distinguished representative of legal science and legal philosophy as they are known on the European continent - no accident, given the role of the civil law tradition in his home country, Argentina. Over the past half-century, Bulygin has engaged virtually all major legal philosophers in the English-speaking countries, including H.L.A. Hart, Ronald Dworkin, and Joseph Raz. Bulygin's essays, several written together with his eminent colleague and close friend Carlos E. Alchourron, reflect the genre familiar from Alf Ross's On Law and Justice, Hans Kelsen's Pure Theory of...