The edition of the works of the three sixth-century BC Milesian philosophers, Thales, Anaximander and Anaximenes, follows the chronological arrangement (from Plato and Aristotle to Albertus Magnus) of the underlying concept of the new edition of Pre-Socratic philosophers‑ that is to document their transmission and the intentions behind the various traditions. The Greek, Latin and Syro-Arabian textual evidence is presented together with a German translation. The texts are supplemented by explanatory footnotes, a critical apparatus and, above all, an apparatus listing similia to support the understanding of the branches of transmission. Extensive indices ensure that the volumes are easy to use. The first volume documents the evidence for Thales: a total of some 600 references and texts.