Book excerpt: From books blurb: Darwinism and human affairs. Drawing on recent developments in biology, a distinguished scholar discusses human behavior in terms of modern evolutionary theory. With clarity and precision, he argues that evolution can be used as an explanatory principle to help understand a wide range of human social activity. This line of inquiry leads him to some far-reaching speculations about the reasons for cultural change and it directions. The book begins with a review of basic evolutionary theory, presenting evidence to support the proposition that human social organization arises out of characteristics evolved by the process of natural selection. This approach resolves the apparent contradiction between the concepts of humans as either hedonistic individuals or groups altruists, by showing that they are actually both, and by explaining how this can be true. To test this view of human evolution, the author examines various predictions about human behavior that follow logically from the principle of natural selection. Cultural patterns in marriage, inheritance, and social altruism are explored, and the concepts of justice, ethics, and morality are interpreted in new ways. The result is a better understanding of the relationship between the process of organic evolution and the structure, variations, and significance of human behavior.