 He returned to Germany in 1956 and died in Berlin in 1959.He is best known among classicists for his highly important work "Fragmente der griechischen Historiker", a collection of text fragments of ancient Greek historians.Also significant is his long entry in the "Realencyclopädie der Classischen Altertumswissenschaft" on the Greek historian Herodotus; written in 1913, this article established many of the questions that would come to dominate modern Herodotean scholarship.