Translated by C.T. Odhner from Swedish manuscripts of 1718; 1719. 1899. OS. Revised edition in preparation. Fragments of a remarkable theory about “our most subtle nature, showing that our moving and living force consists of vibrations.” This prelude to Swedenborg’s search for the soul is his first examination of the relation between physiology and mental consciousness. He conceives of human sensations as consisting of subtle vibrations or “tremulations.” While parts of the original treatise have been lost, this short volume includes all known fragments of Swedenborg on the theory, and outlines his earliest thinking on the soul-body problem. Index.