PREFACE TO THE SECOND EDITION.
To my great joy I have lived to revise even this little work, after a lapse of nineteen years, and that joy is enhanced by the special importance of this treatise for my philosophy. For, starting from the purely empirical, from the observations of unbiassed physical investigators—themselves following the clue of their own special sciences—I here immediately arrive at the very kernel of my Metaphysics; I establish its points of contact with the physical sciences and thus corroborate my fundamental dogma, in a sense, as the arithmetician proves a sum: for by this I not only confirm it more closely and specially, but even make it more clearly, easily, and rightly understood than anywhere else.
The improvements in this new edition are confined almost entirely to the Additions; for scarcely anything that is worth mentioning in the First Edition has been left out, while I have inserted many and, in some cases, important new passages.
But, even in a general sense, it may be looked upon as a good sign, that a new edition of the present treatise should have been found necessary; since it shows that there is an interest in serious philosophy and confirms the fact that the necessity for real progress in this direction is now more strongly felt than ever. This is based upon two circumstances. The first is the unparalleled zeal and activity displayed in every branch of Natural Science which, as
