and one of the founders of the Uppsala school. Hägerström had a resolutely anti-metaphysical stance, and was one of the first philosophers to adopt a non-cognitivist theory of evaluative and normative discourse. His aim was to remove metaphysical and ideological preconceptions from the philosophy of law and his work was influential on Scandinavian legal theory, and subsequent writers such as Alf Ross. Books included the early The Principle of Science (1908), and Inquiries into the Nature of Law and Morals (1958).