Punctuation and spelling were made consistent when a predominant preference was found in this book; otherwise they were not changed.

Simple typographical errors were corrected. Occasional unbalanced quotation marks were corrected when possible. Missing letters and punctuation marks were restored when possible.

Ambiguous hyphens at the ends of lines were retained; occurrences of inconsistent hyphenation have not been changed.

Transcriber retained the “Figure” identifications within the illustrations originally on pages 122, 131, and 203. The identifications of all other Figures only appear in the captions.

The captionless illustration on Page 1 is a decorative headpiece; captionless illustrations at the ends of chapters are decorative tailpieces.

Sequence error corrected in the Table of Contents.

In the Appendix, Figures 321–324 originally were numbered 1–4, but were changed here to avoid ambiguity with the figure numbers in the main part of the book.