TO THE SECOND ENGLISH EDITION.
THIS second edition includes all that the author has incorporated in the fourth German edition. The most extended additions to the text are to be found on the following pages of this edition: 18-20, 50, 78-79, 94, 97-99, 108, 110-113, 127, 138, 184-185, 192-193, 221-222, 232-233, 248-251, 271-274, 285-286, 306-307, 330, 341-345, 346-349. There are also a number of lesser revisions. The reading references which the author inserted in his fourth edition are repeated without change of any kind except the substitution of English titles for German titles wherever this was possible. Since the references are presented by the author as a selected bibliography, it did not seem wise to make any additions. The pages on which these references appear in this edition are given in the index under “References”.
Changes have been freely introduced in the phraseology of the English translation. It has not been necessary to make any significant changes in the terminology adopted for the earlier edition. The translator is under obligations to the reviewers of his work, and to a number of those who have used the book as a class text-book, for suggestions of which he has taken advantage in his work of revision. It is hoped that these friendly critics will find the present form
