The proofreaders identified 19 minor typographical errors, none of which affected the sense of the text.

Inconsistent hyphenation has been retained.

In the original text footnotes are printed on the same page. In this etext, footnotes have been gathered at the end of the book. Click on a footnote reference[A] to go to the text of the note. Use the Back button or click on the footnote label to return.

In the html etext, the original page numbers appear in the right margin. To link to a particular page, append #Page_nnn to the book URL.