 Bolzano’s teaching was concerned exclusively with fundamental topics of theology; in addition he worked mainly in logic. Nevertheless, his scientific development began in mathematics. Already in 1804 Bolzano’s first scientific publication, namely Considerations on Some Objects of Elementary Geometry appeared; further mathematical publications followed between 1810 and 1817. Bolzano returned ultimately to mathematics in order to create a new foundation on which mathematics as a whole could be built; he succeeded in doing this, however, only in bits and pieces. 