as such, it can itself be only a phaenomenon; and consequently, like all other phaenomena, it requires a further explanation; and this explanation is supplied by Metaphysics. Philosophy indeed is such a connected whole that it is impossible to exhaustively discuss any one part without all the others being involved.

Thus Plato says quite correctly: ????s o?? ??s?? ????? ????? ?ata???sa? o?e? d??at?? e??a?, ??e? t?? t?? ???? ??se??; (Phaedr., p. 371, Ed. Bip.) (Do you think then it is possible to understand at all adequately the nature of the soul, without at the same time understanding the nature of the Whole, i.e., the totality of things?) The metaphysics of nature, the metaphysics of morals, and the metaphysics of the beautiful mutually presuppose each other, and only when taken as connected