Chapter VI. On the third class of objects for the subject and that form of the principle of sufficient reason which predominates in it.
§ 35. Explanation of this Class of Objects.
IT is the formal part of complete representations—that is to say, the intuitions given us à priori of the forms of the outer and inner sense, i.e. of Space and of Time—which constitutes the Third Class of Objects for our representative faculty.
As pure intuitions, these forms are objects for the faculty of representation by themselves and apart from complete representations and from the determinations of being empty or filled which these representations first add to them; since even pure points and pure lines cannot be brought to sensuous perception, but are only à priori intuitions, just as the infinite expansion and the infinite divisibility of Space and of Time are exclusively objects of pure intuition and foreign to empirical perception. That which distinguishes the third class of representations, in which Space and Time are pure intuitions, from the first class, in which they are sensuously (and moreover conjointly) perceived, is Matter, which I have therefore defined, on the one hand, as the perceptibility of Space and Time, on the other, as objectified Causality.
The form of Causality, on the contrary, which belongs to the Understanding, is not separately and by itself
