Pre-Socratic philosophy. - Plato. - Aristotle. - Post-Aristotelian philosophy. - The Theory of art: Quintilian, Longinus, and Philostratus. - Plotinus. - The lesser Neoplatonists. - Neoplatonic views of three early Christians. - Mediaeval descriptive psychology. - The psychology of the mystics. - Dante's theory of vision. - Conclusion.
