application/pdf article en-US TWO Academicus Academicus 2079-3715 2309-1088 © Copyright 2010, Academicus, All rights reserved. MMXXI 24 Ajdukiewicz and the Notion of Conceptual Apparatus Michele Marsonet 10.7336/academicus.2021.24.15 226 229 2021-07-01T06:30Z 1534 language; conceptual apparatus; conceptual scheme; ontology; empiricism The Polish philosopher Kazimierz Ajdukiewicz adopted the notion of “conceptual apparatus”, which is very similar to the idea of “conceptual scheme” put forward by Donald Davidson, Willard V. Quine, Nicholas Rescher and others. Ajdukiewicz’s theses are, in this regard, very important although less known, and he treated cognitive processes as inseparably connected with language.