



Produced by Charlene Taylor, Paul Clark, Marilynda
Fraser-Cunliffe and the Online Distributed Proofreading
Team at http://www.pgdp.net






    Transcriber's Note:

    Every effort has been made to replicate this text as faithfully as
    possible, including inconsistencies in hyphenation. It seems that
    the italic typeface used in this book did not have an ae ligature.
    Names of genera and higher taxonomic groups are not capitalized in
    the printed book: they have bee left unchanged. Some changes have
    been made. They are listed at the end of the text.

    Italic text has been marked with _underscores_.
    OE ligatures have been expanded.




THE RIDDLE OF THE UNIVERSE


[Illustration: ERNST HAECKEL]




                               THE RIDDLE
                            OF THE UNIVERSE

                            _AT THE CLOSE OF
                        THE NINETEENTH CENTURY_

                                   BY

                             ERNST HAECKEL

            (Ph.D., M.D., LL.D., Sc.D., and Professor at the
                          University of Jena)

                  AUTHOR OF "THE HISTORY OF