The philosophical papers comprising this volume range from process metaphysics and theology, through the phenomenological study of intentionality, to the foundations of geometry and of the system of real numbers. New light, it is thought, is shed on all these topics, some of them being of the highest interest and under intensive investigation in contemporary philosophical discussion. Metaphysi- cians, process theologians, semanticists, theorists of knowledge, phenomenologists, and philosophers of mathematics will thus find in this book, it is hoped, helpful materials and methods. The categoreal scheme of Whiteheads Process and Reality is discussed rather fully from a logical point of view in the first paper [I] in the light of the authors previous work on the logico-metaphysical theory of events. The clarification that results is thought to provide a new depth and precision to the problem of interpreting one of the most difficult books in the recent history of metaphysics and cosmol- ogy. A detailed examination of some aspects of Hartshornes recent Creative Synthesis and Philosophic Method is given in II. This book is perhaps the most significant work on process philosophy since Process and Reality itself, and its logical underpinnings thus merit a full critical discussion.