This volume analyzes the biological and philosophical disagreements in evolutionary ethics and points out difficulties with the interpretations. The book is divided into four sections. The first is an historical introduction to the origin of evolutionary ethics, showing how different evolutionary ethics was a hundred years ago, and how distant Huxley is from most of us now. The second section argues for a sociobiological interpretation of evolutionary ethics. The third section presents the view opposite to that of the second section and rejects the sociobiological interpretation. The fourth section deals objectively with many complex and fundamental issues from diverse perspectives.