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, Syrian, Arabic, and Hebrew textual evidence is presented together with a German translation. The texts are supplemented by explanatory footnotes, a critical apparatus (if applicable) and, above all, an apparatus listing similia to support the understanding of the branches of transmission. The evidence for Thales is composed of a total of some 600 references and texts (vol. 1), for the other two Milesians of about 250 each (vol. 2). Extensive indices ensure that the volumes are easy to use.