The progress of the human race is effected by the operation of two forces which correspond in most respects to what in physics are often called, for want of better terms, the centripetal and centrifugal forces. These are the forces of convergence and divergence, the one tending to concentration of powers and properties, and the other to their separateness or the independence of parts. Socialism and Individualism are to appearance conflicting, though in reality complemental, in their relations to the societary movement.