In the first lecture, Steiner shows how in the Lemurian epoch Luciferic beings intervened in human evolution, making possible freedom, material desires, and evil-doing, while in Atlantean times, Ahrimanic beings made possible “conscious sin”; and in our own epoch, Asuric beings will intervene. The deed of Christ alone now makes possible humanity's return to the spiritual. The second lecture deals with “Mephistopheles and Earthquakes.” – The original German texts of these lectures are entitled, Spiritual-Scientific Anthropology/Knowledge of Man. The original German texts of these lectures can be found in the Collected Edition of Rudolf Steiner's works under the title: “Geisteswissenschaftliche Menschenkunde,” No. 107 in the Bibliographical Survey, 1961.