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.