 Bolzano did not long remain satisfied with the logic sketched in the Contributions Already in 1812, he recorded his intention to develop a new logic which would lead to a “total transformation of the a priori sciences”. The Theory of Science, written between 1820 and 1830 and published in 1837, marks its realization, embedded in the broader context of general epistemology and methodology of science (which Bolzano also counted as logic in a broader sense).