1. Footnotes have been moved from the middle of a paragraph to the end of the chapter referring to the particular footnote.

2. The page headings in the original text have been changed to section headings in this HTML version.

3. The original text includes Greek characters. For this HTML version these letters have been replaced with transliterations.

4. Obvious punctuation errors have been silently corrected, such as, addition of missing period at the end of sentences, etc.

5. Other than the changes listed above, printer's inconsistencies in spelling, hyphenation, and ligature usage have been retained.