--Retained publication information from the printed edition: this eBook
is public-domain in the country of publication.
--Corrected a few palpable typographical errors.
--Transcribed some text from illustrations, for the sake of the text
versions.
--Added a Table of Contents based on headings in the text.
--Added page numbers for convenient reference.
--In the text versions only, text in italics is delimited by
_underscores_.
--Provided in {curly brackets} a conjectural completion of the truncated
“Joshua Tree” entry, based on information from other published
sources.