Christian Martin Julius Frauenstadt, a German philosopher, born at Bojanowo, in Posen, April 17, 1813. He studied in Berlin, was tutor in the family of Baron Meyendorff in 1841-'4, and next in that of Prince Sayn-Wittgen-stein in Russia till 184G. Since 1848 he has resided in Berlin. He was at first to some extent an adherent of Hegel, the influence of whose doctrines is apparent in his works Ueber das wahre Verhaltniss der Vernunft zur Offen-barung (1848), Aesthetische Fragen (1853), etc. He afterward made the acquaintance of Schopenhauer and became his most distinguished follower. Among his subsequent works are: Ueber die Naturwissenschaft, etc. (1855); Der Mater ialismus (1856); Das sittliche Leben, ethische Studien (Leipsic, 1868); and Blicke in die intellektuelle, physische und moralische Welt (1869). He published several works relating to Schopenhauer and to his literary remains (1861-'4), and edited his complete works (6 vols., Leipsic, 1874).