- Retained publication information from the printed edition: this eBook is public-domain in the country of publication.
- In the text versions only, text in italics is delimited by _underscores_.
- Silently corrected a few typos.
- Tweaked the order of the Table of Contents to match the text.
- Incorporated the “erratum” (from an inserted slip) into the text. The erroneous Step 3 replicated Step 2.
- Inserted references to unreferenced endnotes at apparently-appropriate places.
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