Preface. Introduction. The Reception of the Lvov-Warsaw School; J. Wolenski. Part I: History and Comparisons. Twardowski's Distinction Between Actions and Products; J. Brandl. On Ajdukiewicz's Empirical Meaning- Rule and Wittgenstein's Defining Criterion; T. Czarnecki. Inspirations and Controversies: From the Letters Between K. Twardowski and A. Meinong; R. Jadczak. The Lvov-Warsaw School - the First School of Non-Positivist Scientific and Analytic Philosophy; W. Krajewski. Women's Contributions to the Achievements of the Lvov-Warsaw School: A Survey; E. Pakszys. Truth-Bearers from Twardowski to Tarski; A. Rojszczak. Twardowski and Husserl on Wholes and Parts; M. Rosiak. The Rationalistic Paradigm of Franz Brentano and Kazimierz Twardowski; E.G. Vinogradov. Lukasiewicz's Interpretation of Aristotle's Concept of Possibility; U. Zeglen. Part II: Lesniewski. De Veritate: Another Chapter. The Bolzano-Lesniewski Connection; A. Betti. Lesniewski's Conception of Logic; R. Poli, M. Libardi. Non-Elementary Exegesis of Twardowski's Theory of Presentation; V.L. Vasiukov. On Some Essential Subsystems of Lesniewski's Ontology and the Equivalence Between the Singular Barbara and the Law of Leibniz in Ontology; T. Waragai. Part III: Philosophy of Language. The Paradox of Grelling and Nelson Presented as a Veridical Observation Concerning Naming; A. Grzegorczyk. Dambska, Quine and the So-Called Empty Names; M. Marsonet. Truth and Time; K. Misiuna. The Postulate of Precision: Its Sense and Its Limits; M. Przelecki. Polish Logic, Language and Philosophy of Language; R. Zuber. Part IV: Logic and the Foundations of Mathematics. The Ajdukiewicz Calculus, Polish Notationand Hilbert-Style Proofs; W. Buszkowski. Ja kowski and Gentzen Approaches to Natural Deduction and Related Systems; A. Indrzejczak. The Contribution of Polish Logicians to Recursion Theory; R. Murawski. Studying Incompleteness of Information: A Class of Information Logics; E. Or owska. Part V: Ontology, Epistemology, Philosophy of Science. On ukasiewicz's Theory of Probability; T. Childers, O. Majer. On What There Is Not A Vindication of Reism; J. Czerniawski. On the Concept of a Subject of Cognition in Ajdukiewicz's Philosophy; A. Kanik. Induction and Probability in the Lvov-Warsaw School; I. Niiniluoto. ukasiewicz's Logical Probability and a Puzzle About Conditionalization; T. Placek. Part VI: Logic and Philosophy. Truth as Consensus. A Logical Analysis; K. Kijania-Placek. The Lvov-Warsaw School and the Problem of a Logical Formalism for General Systems Theory; A.I. Uyemov. From Closure-Operatic Deductive Methodology to Non-Standard Alternatives; S.J. Surma. Forgotten and Neglected Solutions of Problems in Philosophical Logic; P. Weingartner. Index of Names.