The book is divided into chapters, but several themes run across them. This is, in fact, the reason for writing a book rather than a number of independent articles; for it appears that several moments of Kant's work are characterized by similar problems, and consequently we might be unable to see the impact of these on a more 1 i mi ted canvas. But further, and perhaps no less importantly, the shared problems are likely to be indicative of the nature of the whole area under discussion. Given this, to concentrate our attention on them should provide clarification not accessible in any other way. It is one of the objects of the present book to obtai n thi s clarification, and to apply it to the area itself, rather than merely to utilize the results in Kantian exegesis and elucidation. Thus the aim is not predominantly historical. Of the various themes, the theme of Space and Time turns out to be of prime importance to the whole picture presented, and within it, the theme of space. This is not perhaps surprising, for Kant's central task is to provide for objectivity; i. e., to explain how a "subjective" stream of perceptions can amount to a perception of the world in which there are both subjective and objective moments.