What follows may appear to have been plagiarized from the wikipedia article on The Problem of Universals. It isn't though: I was the original author of much of that article, and the material that follows still survives there in roughly the form I originally gave it years ago. So I feel free to steal it back from myself. --------------- William James learned pragmatism, the way of understanding an idea by its practical effects, from his friend Peirce, but he gave it new significance. (Which was not to Peirce's taste - he came to complain that James had "kidnapped" the term and eventually to call himself a "pragmaticist" instead.) Although James certainly agreed with Peirce and against Berkeley that general ideas exist as a psychological fact, he was a nominalist in his ontology: From every point of view, the overwhelming and portentous character ascribed to universal conceptions is surprising. Why, from Plato and Aristotle, philosophers should...