Transcriber’s Note

The table of contents has been added in the electronic version.

The appendix is paginated separately. The page numbers of the appendix have been prefixed with “A-”.

“Ibid.” is sometimes printed in italics, sometimes not.

In the original, the Appendix was printed in a smaller font.

The book has many inconsistencies in spelling, capitalization or punctuation, especially in the quotations from foreign languages, where sometimes diacritical signs are missing or wrong. They were not corrected or modernized, except in the following places which can be regarded as printing errors.