This, however, namely the objective form of experience in general, contains all synthesis that is requisite for the cognition of objects.a A concept that in cludes a synthesis in it is to be held as empty, and does not relate to any object, if this synthesis does not belong to experience, either as borrowed from it, in which case it is an empirical concept, or as one on which, as a priori condition, experience in general (its form) rests, and then it is a pure concept, which nevertheless belongs to experience, since its objectb can be encountered only in the latter.