It has been claimed that following the decline of Marxism and Freudianism, Darwinism has become the dominant intellectual paradigm of our day. In the mass media there are many bitter disputes between today's new Darwinians and their opponents, often over religion. But the 'neo-Darwinian paradigm' is not as simple or as seamless as either its advocates or its opponents would sometimes have us believe. Biology is in a state of development which defies the standard stereotypes. The papers in this volume, written by some of the leading philosophers in the field, bring out many of the fascinating and complex issues which arise in current attempts to account for life and its development.