- Logic is the study of ideal method in thought and research: observation and introspection, deduction and induction, hypothesis and experiment, analysis and synthesis -- such are the forms of human activity which logic tries to understand and guide. It is a dull study for most of us, and yet the great events in the history of thought are the improvements men have made in their methods of thinking and research.
- Aesthetics is the study of ideal form, or beauty. It is the philosophy of art.
- Ethics is the study of ideal conduct. The highest knowledge, said Socrates, is the knowledge of good and evil, the knowledge of the wisdom of life.
- Politics is the study of ideal social organization (it is not, as one might suppose, the art and science of capturing and keeping office). Monarchy, aristocracy, democracy, socialism, anarchism, feminism -- these are the dramatis personae of political philosophy.
- And finally, metaphysics (which gets into so much trouble because it is not, like the other forms of philosophy, an attempt to coordinate the real in the light of the ideal) is the study of the "ultimate reality" of all things: of the real and final nature of "matter" (ontology), of "mind" (philosophical psychology) and of the interrelation of "mind" and "matter" in the processes of perception and knowledge (epistemology).