The second mode is, of necessity, empirical, and cannot be carried out without the introduction of empirical concepts. For otherwise it would not be possible to keep the representations of reality separate, since they constitute a continuous and compact series. By means of empirical concepts, history is divided into the history of the State, of the Church, of society, of the family, of religion (as distinct from philosophy), or of philosophy (as distinct from religion). Or, as the history of philosophy, it is divided into the history of idealism, of materialism, of scepticism; or as the history of art, into the history of painting, of poetry, of the drama, of fiction. Or again, as the history of civilization, it is divided into oriental history--history of Greece, of Rome, of the Middle Ages, of the Renaissance, of the Reformation, and so on. Even these last mentioned criteria (Greece, Rome, the Middle Ages, etc.) are empirical concepts and not representations, because, as we know,[2] the representation is individual, and when it is made constant and general it is changed into a concept of the individual, the summary and symbol of several representations, in fact, the empirical concept. Each one of these divisions is valid in so far as it is useful; and equally valid, under a like condition, are all the divisions that have been conceived, and the infinite number that are conceivable. [Sidenote: _Empirical concepts in history and the false theory as to the function that they have there._]