Abstract
While the ethics and the sociology of The Open Society can stand up to criticism after 50 years, it is argued that Popper's thesis that closed societies are prompted and promoted by "historicism" cannot. Moreover, Popper's conceptions of "historicism" and of "developmental law" are based on a misunderstanding of our knowledge of history, the practice of historical writing, and the discipline of sociology. In conclusion there is an attempt to explain why, of all people Popper ever criticized for their historicism, Darwin alone was singled out by him for exoneration.