The term "reism' was introduced by Tadeusz Kotarbiński to denote the philosophical view that the category of things is the sole ontological category.¹ Shortly after Elementy went in print, Kazimierz Twardowski pointed out in a letter to Kotarbiński, that a similar ontological theory has been elaborated by Franz Brentano in the last period of his life. In 1930, Kotarbiński delivered a lecture at 7th International Philosophical Congress in Oxford. After the congress, he received a letter from Georg Katkov with further information on Brentano's reism.²