exhaustively study. Only the fundamental relation Between, in the generalized sense, attracted our closer attention, and has represented for us, in this discussion, all the Categories of Relation, although, of course, the very nature of serial order implies also the existence of countless other relations. On the basis of this conception we reached the Category of Ordered Series, although not in its only form. For the Category of Number, and of the Self-Representative System, or Well-Ordered Series, was fully discussed in our Supplementary Essay, and is here presupposed. Nor have we attempted to discuss the Category of Continuity, which would find a place in a full treatment of the Ordered Series. On the basis, however, of the Concept of Series, we indicated the nature of the more complex Category of the Ordered System, in which many series are interwoven. And thus we were led to an indication of the scope of the Category of Law as it appears in the World of Description.
So much for the mere list of concepts. Plainly these are indeed fundamental notions regarding the realm of the facts that we ought to acknowledge. But are they exhaustive? Has our world of fact no other aspect than this?
I answer at once, the world of the objects of my present possible Attention, where attention means simply the discrimination of what is already assumed to be there, is by no means the final or determinate world that the Will seeks. For, first, it is on its face a world of abstract aspects, and not of finality. It is a world of Validity, and not explicitly a world of Individuals such as our Fourth Conception demands. It is, moreover,
