Punctuation, hyphenation, 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. Ambiguous hyphens at the ends of lines were retained. Index not checked for proper alphabetization or correct page references. In the original book, chapter headings were accompanied by illustrations, sometimes above, sometimes below, and sometimes adjacent. In this eBook those ilustrations always appear below the headings.