  Twardowski appeared in Lvov with the ambitious plan of creating a scientific philosophy (in Brentano’s spirit) in Poland (at that time, Poland was partitioned between Austro-Hungary, Germany and Russia; Lvov belonged to the Austro-Hungarian Empire.) In fact, he subordinated all his activities to achieving this task and considerably limited his own scientific work. Twardowski was an extraordinary and charismatic teacher. He very soon attracted many young people to philosophy. After ten years of teaching he sometimes had about 200 candidates for seminars and 2000 attendants of his lectures. He propagated a clear style of writing and speaking about philosophical matters, insisted upon justification of philosophical theses and sharply distinguished philosophy as a science from world-views. Following Brentano, he favoured problems on the borderline of descriptive psychology, grammar and logic (he supplemented his object/content distinction by that of actions/products). A photo of Twardowski’ seminar participants taken during the 1925–1926 academic year is available (see the supplement), with  most of the participants identified.