An imposing edifice of thought. Every one of its twenty chapters will richly repay careful reading. Those passages dealing with ethics, love, the significance of knowledge, and the meaning of life are hard to surpass. - New York Evening Post The title of this book, Tertium Organum, boldly refers no less to a reorganization of all knowledge, but it is primarily a study of psychology, more specifically the psychology of our higher mind. For Ouspensky what we can call the higher mind represents, within a single person, the development of an entirely new way of understanding. In short, psychology is the art of self-study. With remarkable scope and sophistication, Ouspensky shows us in this book, which has been hailed as a work of genius, just how vast and strange our universe really is. P. D. PETYR DEMIANOVICH OUSPENSKY 1878-1947 was a Russian mathematician and philosopher turned mystic, who combined geometry and psychology in his discussion of higher dimensions of existence. After travel