 Brentano’s ontology is known to a broader audience only through posthumously published works that were edited by his late students Oskar Kraus and Alfred Kastil, who considered his late position most important and accordingly put less emphasis on Brentano’s earlier phases. Only recently the development of Brentano’s views on ontology has gained more attention, mainly through the work of scholars who were able to study unpublished manuscripts in the archives (cf., for example, Chrudzimski 2004). This underlines once more the need of a critical edition of Brentano’s entire Nachlass, which would make it possible for a broader audience to critically assess the development of Brentano’s views in ontology. 