- Silently corrected typographical errors and variations in spelling.
- The original was printed in two column text with illustrations sometimes spanning both columns. In order to reduce ambiguity, the illustrations have been moved adjacent to the paragraph that refers to them.
- Footnotes have been renumbered.
- The cover/title page image has been retouched to remove flaws.
- Images of the original pages are available through Internet Archive. See https://archive.org/details/CAT78693718
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