The present paper is concerned with a minor offshoot of the Warsaw School of Logic, namely with a small group of scholars who decided to try and introduce into the Catholic School of Philosophy and Theology the methods developed and practised by the Warsaw logicians. In time the group acquired a somewhat ponderous name of ‘The Cracow Circle’. The task it had set themselves was by no means simple if one realizes that there were, at that time, about 150 professors and teachers of philosophy and systematic theology in the five university Schools of Theology and in the many seminaries for priests in Poland. Their number compared favourably with that of the teachers of philosophy in other university Schools.