 Any of these three theses might have been regarded as a defensible statement of the subject-matter of what was called ‘metaphysics’ until the seventeenth century. But then, rather suddenly, many topics and problems that Aristotle and the Medievals would have classified as belonging to physics (the relation of mind and body, for example, or the freedom of the will, or personal identity across time) began to be reassigned to metaphysics. One might almost say that in the seventeenth century metaphysics began to be a catch-all category, a repository of philosophical problems that could not be otherwise classified as epistemology, logic, ethics or other branches of philosophy. (It was at about that time that the word ‘ontology’ was invented—to be a name for the science of being as such, an office that the word ‘metaphysics’ could no longer fill.)  The academic rationalists of the post-Leibnizian school were aware that the word ‘metaphysics’ had come to be used in a more inclusive sense than it had once been. Christian Wolff attempted to justify this more inclusive sense of the word by this device: while the subject-matter of metaphysics is being, being can be investigated either in general or in relation to objects in particular categories. He distinguished between ‘general metaphysics’ (or ontology), the study of being as such, and the various branches of ‘special metaphysics’, which study the being of objects of various special sorts, such as souls and material bodies. (He does not assign first causes to general metaphysics, however: the study of first causes belongs to natural theology, a branch of special metaphysics.) It is doubtful whether this maneuver is anything more than a verbal ploy. In what sense, for example, is the practitioner of rational psychology (the branch of special metaphysics devoted to the soul) engaged in a study of being? Do souls have a different sort of being from that of other objects?—so that in studying the soul one learns not only about its nature (that is, its properties: rationality, immateriality, immortality, its capacity or lack thereof to affect the body …), but also about its “mode of being”, and hence learns something about being? It is certainly not true that all, or even very many, rational psychologists said anything, qua rational psychologists, that could plausibly be construed as a contribution to our understanding of being.