On the Soul
Notebook
Aristotle's On the Soul (Peri Psychēs, De Anima) is the founding work of the philosophy of mind and of psychology. In three books Aristotle defines the soul not as a separate substance but as the 'form' or first actuality of a living body—the principle of life that a thing has by being alive—and analyzes its powers of nutrition, sensation, imagination, and thought. His account of perception and of the active intellect shaped medieval and modern philosophy alike. This is Charles Collier's 1855 translation, published as 'On the Vital Principle.'
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