 Another respect in which Łukasiewicz continued the tradition of the Brentano School was in his respect for the history of philosophy, particularly that of Aristotle and the British empiricists. (He and Twardowski translated Hume’s first Enquiry into Polish.) Twardowski, who knew Bolzano’s work well, pointed out similarities between concepts in Bolzano’s and Łukasiewicz’s theories of probability. The respect for history also lay behind Łukasiewicz’s groundbreaking studies in the history of logic, notably his accounts of Stoic propositional logic and Aristotle’s syllogistic.