in the original text.
Underscores are also used to designate a subscript. e.g. C_{6} H_{6}.
Equal signs “=” before and after a word or phrase indicate =bold=
in the original text.
Carat symbol “^” designates a superscript.
Small capitals have been converted to SOLID capitals.
Illustrations have been moved so they do not break up paragraphs.
Old or antiquated spellings have been preserved.
Typographical errors have been silently corrected but other variations
in spelling and punctuation remain unaltered.