It is in this latter that the thinking self must now seek the conditions of the use of its logical functions for categories of substance, cause, etc., so as not merely to indicate itself as objectC in itself through the I, but also to determine its kind of existence,.e., to cognize it as noumenon; which, however, is impossible, since inner empirical intuition is sensible, and makes available nothing but data of appearance, which affords nothing for knowledge of the separate existence of the objectd of pure consciousness, but can serve merely in behalf of experience.