The primary contributions of this work are in three overlapping categories: (i) the history of ideas (and in particular the history of the idea of value) and moral philosophy in both continental and Anglo-American traditions, (ii) the identification and interpretation of ethical emotivism as one of the major twentieth-century ethical theories, and (iii) the evolution of a philosophically viable form of ethical emotivism as an alternative to utilitarianism and Kantianism. In addition, along the way, many particular points are touched upon, e. g. , the relation of Hume to Stevenson and...