Julius Frauenstädt.
Berlin, August, 1864.
EDITOR'S PREFACE TO THE FOURTH EDITION.
The present Fourth Edition is of the same content as the Third; therefore it contains the same corrections and additions which I had already inserted in the Third Edition from Schopenhauer's own interleaved copy of this work.
Julius Frauenstädt.
Berlin, September, 1877.
ON THE FOURFOLD ROOT
OF THE
PRINCIPLE OF SUFFICIENT REASON.