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 retained.

Inconsistent hyphenation, e.g., "co-operation" and "cooperation", has been retained unless one form predominated.

Ambiguous hyphens at the ends of lines were retained.

Page 174: "and sheet force of will" is misprint for "sheer".

Page 249: Several colons would be semi-colons in modern practice.

Index was not well-alphabetized; corrected here. Diacriticals and ligatures have been alphabetized as plain letters.