- Retained publication information from the printed edition: this eBook is public-domain in the country of publication.
- Silently corrected a few palpable typos, leaving period spellings unchanged.
- In the text versions only, text in italics is delimited by _underscores_.
- Added subheadings in the text to match entries in the Table of Contents.
- Added captions to illustrations based on the attributions in front matter.
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