The principles of psychology /
by Herbert Spencer.
- [3d edition]
- New York : D. Appleton, 1890.
- 2 volumes ; 21 cm.
- System of synthetic philosophy ; v. 4-5 .
- Spencer, Herbert, 1820-1903. System of synthetic philosophy ; v. 4-5. .
The 3d ed. differs mainly by containing a new division: Part VIII.: Congruities.