Let us now, for a moment, revert to the old scholastic forms and the designations usually given in the schools to the several philosophical sciences, and compare with them the division on which our present disquisitions are based. We might, in this respect, say that the first five sections of our treatise have been exclusively devoted to psychology; though not indeed in the ordinary narrow sense of the word, but in one far more extensive, and embracing the whole universe. According to this wider extent and signification of psychology, we have considered the soul relatively, first of all, to the whole of philosophy and its several systems; secondly, to moral life; and, lastly, to revelation, to nature, and to God Himself. The three following Lectures were devoted to an examination of the divine order of things in the several spheres of existence, and to the indications of a ruling Providence discoverable therein. They constitute, therefore, a species of theology; but one, however, empirically conceived and historically worked out from observations in nature and in history, not only in the annals of the external world, but also in the spiritual history of the progressive terms in the development of truth. Such a theological essay exactly corresponds to that notion we so lately advanced, of an applied or mixed science of theology as the peculiar sphere for this part or branch of philosophy which concerns itself with the doctrine of the supreme essence, and the right understanding thereof. Now if, in compliance with olden forms of division and a scholastic phraseology, it be necessary to deliver a scheme of ontology as the philosophical science and cognition of really existent things, and also of their true and real essence, it is clear that such is only conceivable and possible by means of such an applied theology. For how can things be truly real, and how can they as such be known in their inmost essence, except so far as they have their existence and determination in God, and, in this respect, admit of being known by us?