The Principles of Sociology, in Three Volumes (New York: D. Appleton and Company, 1898). http://oll.libertyfund.org/titles/2634,
This is a 3 vol. set of the third revised edition of Herbert Spencer’s magnum opus on sociology which was first published in 1876. In vol. 1 he defines what his theory of sociology is, 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.
The text is in the public domain.