 The book contained many of the themes mentioned so far in this essay, sprinkled into a case study of the transition from geocentric to heliocentric astronomy. But whereas he had previously been arguing in favour of methodology (a “pluralistic” methodology, that is), he had now become dissatisfied with any methodology. He emphasised that older scientific theories, like Aristotle’s theory of motion, had powerful empirical and argumentative support, and stressed, correlatively, that the heroes of the scientific revolution, such as Galileo, were not as scrupulous as they were sometimes represented to be. He portrayed Galileo as making full use of rhetoric, propaganda, and various epistemological tricks in order to support the heliocentric position. The Galileo case is crucial for Feyerabend, since the “scientific revolution” is his paradigm of scientific progress and of radical conceptual change, and Galileo is his hero of the scientific revolution. He also sought further to downgrade the importance of empirical arguments by suggesting that aesthetic criteria, personal whims and social factors have a far more decisive role in the history of science than rationalist or empiricist historiography would indicate. 