Science, ideology, and world view
In the later essays Greene examines the idea of 'Social Darwinism', looking at the ideas of Herbert Spencer and others and asks whether Darwin was a Social Darwinist. His conclusion was that he was, but that his social ideas weren't derived from Darwinism, rather an evolutionary explanation was invented for preconcieved ideas. The idea of society evolving towards an ideal was rather upset by the World Wars, but in the last essay Greene shows how this viewpoint has continued to be popular. Overall I felt the book gives a useful warning of the ever present tendency to derive an 'ought' from an 'is'.