We must cease the process of classifying referred to just now, and also that of the illusion of naturalism connected with it, by means of which imaginary entities created by abstraction are changed into historical facts and classificatory schemes into history, if we wish to understand the difference between history that is history and that due to what are called the natural sciences. This is also called history--_'history of nature'_--but is so only in name. Some few years ago a lively protest was made[1] against the confusion of these two forms of mental labour, one of which offers us genuine history, such as might, for instance, be that of the Peloponnesian War or of Hannibal's wars or of ancient Egyptian civilization, and the other a spurious history, such as that known as the history of animal organisms, of the earth's structure or geology, of the formation of the solar system or cosmogony. It was observed with reason that in many treatises the one has been wrongly connected with the other--that is to say, history of civilization with history of nature, as though the former follows the latter historically. The bottomless abyss between the two was pointed out. This has been observed, however, in a confused way by all, and better by historians of purely historical temperament, who have an instinctive repugnance for natural history and hold themselves carefully aloof from it. It was remembered with reason that the history of historians has always the individually determinate as its object, and proceeds by internal reconstruction, whereas that of the naturalists depends upon types and abstractions and proceeds by analogies. Finally, this so-called history or _quasi-history_ was very accurately defined as an apparently chronological arrangement of things spatially distinct, and it was proposed to describe it with a new and proper name, that of _Metastoria._ Indeed, constructions of this sort are really nothing but classificatory schemes, from the more simple to the more complex. Their terms are obtained by abstract analyses and generalization, and their series appears to the imagination as a history of the successive development of the more complex from the more simple. Their right to exist as classificatory schemes is incontestable, and their utility is also incontestable, for they avail themselves of imagination to assist learning and to aid the memory.