  Naturalists are motivated by the thought that scientific or mathematical standards are the most successful standards we possess. But what does success come to? Very roughly, the following could be taken to be a mark of a discipline's success: (i) among its practitioners, there is a widely shared conception of the discipline's guiding questions and permissible methodology; and (ii) there is progress within the discipline in addressing its guiding questions. One may then try to argue along these lines that physics is more successful than metaphysics, that psychology is more successful than parapsychology, and that astronomy is more successful than astrology.