Among the extensive circle of Brentano's pupils, the philosopher Christian von Ehrenfels held a particularly unique position. He did not belong to the group of orthodox Brentano followers with regard to his philosophical convictions but rather had to be reckoned as a member of the outer circle of the Brentano School which produced such important personalities as Kazimierz Twardowski, Thomas G. Masaryk, Carl Stumpf or Alexius Meinong. And another fact must be kept in mind in order to trace back the roots of Ehrenfels' philosophical development. Ehrenfels, on the one hand, indulged in frequent philosophical discussions with Meinong who as a teacher as well as a friend remained attached to him throughout his life,¹ and on the other hand also was in cordial communication with Brentano which by far exceeded the usual teacher-pupil relationship.