1. Silently corrected obvious typographical errors and variations in
spelling.
2. Retained archaic, non-standard, and uncertain spellings as printed.
3. Enclosed italics font in _underscores_.
4. Enclosed bold font in =equals=.
5. Denoted subscripts by an underscore before a series of subscripted
characters enclosed in curly braces, e.g. H_{2}O.