The central section of Empedocles, On Nature I is reconstructed by combining the Strasburg Papyrus of Empedocles with a series of quotations in Simplicius which comes from the same section. The reconstructed portion of the text begins by demonstrating the principles (four elements, Love, and Strife) and proceeds to a first description of the Cosmic Cyle. The edition of the original Greek text is provided with an interlinear German translation. This is the second, revised edition complemented by an introductorypreface.