Rudolf Seiner intended to inaugurate a method of agriculture that was rational and scientific as well as spiritual. In the first four lectures of his Agriculture Course, he outlined the spiritual-scientific foundations for the biodynamic preparations that are at the heart of this new method. An understanding of these preparations, however, presupposes an understanding of their spiritual-scientific foundations. We will trace the systematic principles contained in these highly condensed and often confusing initial lectures. There will be time for questions both during and after the presentation.