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

Ambiguous hyphens at the ends of lines were retained. Inconsistent hyphenation was not changed.

In the original book, all pages, except the ones with full-page illustrations, included a decorative border. In the versions of this eBook that include illustrations, that border is shown only once, in the image of the Title Page. It has a yellow-green tint that may be an artefact caused by the ageing of the paper. In the Plain Text version of this eBook, that border is indicated only once, just before the Title Page.