Punctuation, hyphenation, and spelling were made consistent when a predominant preference was found in the original book; otherwise they were not changed. Simple typographical errors were corrected; unbalanced quotation marks were remedied when the change was obvious, and otherwise left unbalanced. Illustrations in this eBook have been positioned between paragraphs and outside quotations. In versions of this eBook that support hyperlinks, the page references in the List of Illustrations lead to the corresponding illustrations. In the original book, a few credits referred to more than one illustration on the page. In this ebook, those credits have been duplicated so that each illustration has its own copy. The index was not checked for proper alphabetization or correct page references. Several incorrect page references to illustrations have been silently corrected. Page 160: “to sail eastward” was printed that way; may be a typo for “westward”.