' .., the reviewed collection may be recommended as an important contribution to the history as well as a description of some recent logical investigations. ' Studia Logica 12 (1) 1990

• Leibniz’s Calculus of Strict Implication.- Leibniz’s Modal Calculus of Concepts.- The Logic of Conditions.- Philosophical Pragmatism in Poincare.- A Note on Zeno B3.- Generalizations and Strengthenings of Gödel’s Incompleteness Theorem.- The Logical Work of Mordchaj Wajsberg.- Notes on Wajsberg’s Proof of the Separation Theorem.- Logical Analysis of Thomism The Polish Programme that originated in 1930’s.- On Justification of Questions.- The Logic of Types.- Systems of Computer-Aided Reasoning for Mathematics and Natural Language.- Two Reports on Educational Applications of MIZAR MSE, a System of Computer-Aided Reasoning The application of MIZAR MSE in a course in logic.- The use of MIZAR MSE in a course in foundations of geometry.- Literature.- Index of Names.