The term ethics is used in three different but related ways, signifying (1) a general pattern or "way of life," (2) a set of rules of conduct or "moral code," and (3) inquiry about ways of life and rules of conduct. In the first sense we speak of Buddhist or Christian ethics; in the second, we speak of professional ethics and of unethical behavior. In the third sense, ethics is a branch of philosophy that is frequently given the special name of metaethics. The present discussion will be limited to the history of philosophical or "meta" ethics, for two reasons. First, because it is impossible to cover, with any degree of thoroughness, the history of ethics in either of the first two senses. Practices and the codification of practices are the threads out of which all of human culture is woven, so that the history of ethics...