1. Corrected the pagination error mentioned in footnote 1 as well as
incorrect page number references in the Contents.
2. Did not change “Lionardo da Vinci” used consistently used throughout
the book with exception of picture caption.
3. Silently corrected typographical errors.
4. Retained anachronistic and non-standard spellings as printed.
5. Enclosed italics font in _underscores_.
6. Superscripts are denoted by a carat before a single superscript
character or a series of superscripted characters enclosed in
curly braces, e.g. M^r. or M^{ister}.