Principia Ethica set the agenda for analytical metaethics. Moore’s unrelenting focus on fundamentals both brought metaethics into view as a potentially separate area of philosophical inquiry and provided a model of the analytical techniques necessary to pursue it.1 Moore acknowledged that he wasn’t the first to insist on a basic irreducible core of all ethical concepts. Although he seems not to have appreciated the roots of this thought in eighteenth-century intuitionists like Clarke, Balguy, and Price, not to mention sentimentalists like (...) Hutcheson and Hume, Moore gave full marks to Sidgwick. According to Moore, Sidgwick was the “only . . . ethical writer” to have clearly seen the irreducibility of ethics’ defining notion.2 Nevertheless, twentieth-century meta-. (shrink)