Not since Ernest Nagel\u2019s 1939 monograph on the theory of probability has there been a comprehensive elementary survey of the philosophical problems of probablity and induction. This is an authoritative and up-to-date treatment of the subject, and yet it is relatively brief and nontechnical. Hume\u2019s skeptical arguments regarding the justification of induction are taken as a point of departure, and a variety of traditional and contemporary...