 Early twentieth-century German-speaking philosophy exerted of course a powerful and lasting influence on philosophy in many other countries, notably in the Anglo-American world. For a while Frege’s and Husserl’s arguments against antipsychologism even rose to the status of a paradigmatic achievement in philosophy: ‘There is progress in philosophy after all!’ (Musgrave 1972, 606). As I have indicated in the last section, this assessment of antipsychologism is now widely contested.