Chapter Xl. Preface.

The supplements to this fourth book would be very considerable if it were not that two of its principal subjects which stand specially in need of being supplemented—the freedom of the will and the foundation of ethics—have, on the occasion of prize questions being set by two Scandinavian Academies, been fully worked out by me in the form of a monograph, which was laid before the public in the year 1841 under the title, “The Two Fundamental Problems of Ethics.” Accordingly I assume an acquaintance on the part of my readers with the work which has just been mentioned, just as unconditionally as in the supplements to the second