The Principles of Psychology

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The Principles of Psychology

Title page from the first edition.
Author	William James
Language	English
Subject	Psychology
Publisher	Henry Holt and Company
Publication date	1890
Publication place	United States
Media type	Print (Hardcover and Paperback)
Pages	xviii, 1393

The Principles of Psychology is an 1890 book about psychology by William James, an American philosopher and psychologist who trained to be a physician before going into psychology. The four key concepts in James' book are: stream of consciousness (his most famous psychological metaphor); emotion (later known as the James–Lange theory); habit (human habits are constantly formed to achieve certain results); and will (through James' personal experiences in life).