This volume casts a fresh light on many classical philosophical issues and brings Wittgensteinian ideas to bear on a number of current debates in which naturalism is playing a central role. The first section considers how naturalism could or should be understood. The second section deals with some of the main problematic domains—consciousness, meaning, mathematics—that philosophers have typically sought to naturalise. The third section explores ways in which the conceptual nature of human life might be continuous in important respects with animals. The final section is concerned with the naturalistic status and methodology of philosophy itself.