- Retained publication information from the printed edition: this eBook is public-domain in the country of publication.
- Corrected a few palpable typographical errors.
- Placed illustration captions below the corresponding illustration.
- Modified references to illustration locations to correspond to the reality of a flowing eText, e.g. “shown on the opposite page” might be converted to “shown below” or “shown here”.
- In the text versions only, text in italics is delimited by _underscores_.
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