How did the concept of Western liberalism, rooted in the notions of religious toleration and universal human rights, evolve into the "anything goes" moral relativism of our own late twentieth century society? This is the question at the heart of David Peterson's fascinating examination of the Positivist tradition, one of the most far-reaching philosophical movements of the past two centuries. The book begins prior to the official birth of Positivism with the rise of British Empiricism under David Hume and J