Editorial Foreword; R.S. Cohen. I: A Historico-Critical Introduction; I. Szumilewicz-Lachman. One: Some Data. Two: Kazimierz Twardowski (1866-1938), the Creator of the Lw?w-Warsaw School. Three: The Lw?w-Warsaw School (1895-1939). Four: The LWS and the Vienna Circle. Five: Zygmunt Zawirski, a Short Bio-Bibliography (1882-1948). II: Zygmunt Zawirski: Selected Writings on Time, Logic & the Methodology of Science. One: Reports. Two: Logic. Three: Methodology...