--Retained publication information from the printed edition: this eBook
is public-domain in the country of publication.
--In the text version only, underlined or italicized text is delimited
by _underscores_.
--Where possible, UTF superscript and subscript numbers are used; some
e-reader fonts may not support these characters.
--In the text versions only, other superscript text is preceded by caret
and delimited by ^{brackets}.
--In the text versions only, other subscripted text is preceded by
underscore and delimited by _{brackets}.