Title page from The Principles of Sociology, 3 vols. (1898)

The Principles of Sociology, 3 vols. (1898)

A foundational work in sociological theory that applies evolutionary principles to the study of human societies. Spencer argues that societies, like biological organisms, evolve from simple to complex structures through differentiation and integration. He examines key institutions such as the family, government, economy, and religion, emphasizing the role of voluntary cooperation over state control in social progress.

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In vol. 1 he defines his theory of sociology, how human beings associate with each other in communities, how institution evolve over time, and begins his analysis of institutions with a section on the family, marriage, women and children. In vol. 2 he covers “ceremonial” institutions and political institutions (with his famous distinction between militant and industrial types of society). In vol. 3 he discusses ecclesiastical institutions, professional institutions, and “industrial” (or economic) institutions.

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