ABSTRACT
General Remarks. The text of the book is self-contained and may be read without these Notes. However, a considerable amount of material which is likely to interest all readers of the book will be found here, as well as some references and controversies which may not be of general interest. Readers who wish to consult the Notes for the sake of this material may find it convenient first to read without interruption through the text of a chapter, and then to turn to the Notes.
