Hartmann, a German philosopher, born at Berlin; established his fame by a work entitled the "Philosophy of the Unconscious," which rapidly passed through nine editions; he has since written on pessimism, the moral and the religious consciousness, the philosophy of the beautiful, and spiritualism; he is the founder of a new school of philosophy, which professes to be a synthesis of that of Hegel and that of Schopenhauer, and to aim at the reconciliation of philosophic results with scientific; b. 1842.