Though science and philosophy take different approaches to ontology, metaphysical inferences are relevant to interpreting scientific work, and empirical investigations are relevant to philosophy. This book argues that there is no uniquely rational way to determine which domains of ontology are appropriate for belief, making room for choice in a transformative account of scientific ontology.

This final volume of The Works of William James provides a full record of James's teaching career at Harvard from 1872-1907. It includes working notes for lectures in more than 20 courses. Because his teaching was closely involved with the development of his thought, this material adds a new dimension to our understanding of his philosophy.