The principles of sociology : Vol. 1 / by Herbert Spencer. Spencer, Herbert, 1820-1903. Sociology. 301.01 SPP Includes Index Vol. 1 is: System of synthetic philosophy, vol. 6. : Vol. 2 is: System of synthetic philosophy, vol. 7. : Vol. 3 is: System of synthetic philosophy, vol. 8. London : Williams and Norgate, 1877 1877 1877 Text 3 v. ; eng A system of synthetic philosophy ; v. 6