D.M. Armstrong is an eminent Australian philosopher whose work over many years has dealt with such subjects as the nature of possibility, concepts of the particular and the universal, causes and laws of nature, and the nature of human consciousness. This collection of essays, all specially written for this volume, explores the many facets of Armstrong's work, concentrating on his more recent interests. There are four sections to the book: possibility and identity, universals, laws and causality, and philosophy of mind. The contributors comprise an international group of philosophers from the United States, England, and Australia. An interesting feature of the volume is that Armstrong himself has written responses to each of the essays. There is also a complete bibliography of Armstrong's writings. The volume will be essential reading for metaphysicians and philosophers of mind, as well as for epistemologists and philosophers of science.