EHRENFELS, CHRISTIAN FREIHERR VON (1859 1932), Austrian philosopher, was born on June 2o, 1859, at Rodaun. From 1896 to 1932 he was professor at Prague. The in fluence of Brentano and Meinong is apparent in his System der Werttheorie, 2 vols. (1897-98) and Grundbegriffe der Ethik (1907). His Sexualethik (5907) was followed by other works on sex problems. Ehrenfels was also the author of three dramas: Melusine (1887), the allegorical Hildegard and Der Kampf des Prometheus (1895) . He died Sept. 8, 1932.