This seminal work in psychology provides a comprehensive account of human behavior, drawing on research in a wide range of fields including neuroscience, sociology, and anthropology. The authors, William Chandler Bagley and Stephen Sheldon Colvin, were leading researchers and educators in the early 20th century. This book remains an influential text in the study of human behavior, laying the foundation for many contemporary theories and methodologies in the field.

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it.

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