Book excerpt: In this volume of essays Bertrand Russell is concerned to combat, in one way or another, the growth of dogmatism, whether of the Right or of the Left, which has hitherto characterised our tragic century. This serious purpose inspires them even if, at times, they seem flippant; for those who are solemn and pontifical. In subject they range from Philosophy for the Layman, The Functions of a Teacher, and The Future of Mankind to an Outline of Intellectual Rubbish, Ideas that have helped Mankind and Ideas that have Harmed Mankind.