former refrains from all references to the literature of the subject and
the latter includes far too many, at least for purposes of instruction, and
J.B. Meyer's _Leitfaden_ (1882) is in general confined to biographical and
bibliographical notices; we have mentioned, in the text or the notes and
with the greatest possible regard for the progress of the exposition, both
the chief works of the philosophers themselves and some of the
treatises concerning them. The principles which have guided us in these
selections--to include only the more valuable works and those best adapted
for students' reading, and further to refer as far as possible to the most
recent works--will hardly be in danger of criticism. But we shall not
dispute the probability that many a book worthy of mention may have been
overlooked.

The explanation of a number of philosophical terms, which has been added as
an appendix at the suggestion of the publishers, deals almost entirely
with foreign expressions and gives the preference to the designations of
fundamental movements. It is arranged, as far as possible, so that it may
be used as a subject-index.

JENA, December 23, 1885.



PREFACE TO THE SECOND GERMAN EDITION.

The majority of the alterations and additions in this new edition are in
the first chapter and the last two; no departure from the general character
of the exposition has seemed to me necessary. I desire to return my
sincere thanks for the suggestions which have come to me alike from public
critiques and private communications. In some cases contradictory requests