This is a remarkable book. I accept its main thesis, that propositional vagueness is more fundamental than sentential vagueness. I am in favor of treating vague beliefs in probabilistic terms, and the investigation of how we should reason with vague beliefs and vague desires is a valuable project. There has been relatively little work on this, and Bacon's book goes much further than any before. The idea of using Jeffrey conditioning to explain the impact of vague
beliefs is an excellent one.
Andrew Bacon is Assistant Professor of Philosophy at the University of Southern California. His work typically applies the methods of philosophical logic to issues in metaphysics, epistemology, and the philosophy of language. Recently he has worked on vagueness, the semantic paradoxes, and logic and epistemology of conditional statements.
