Transcriber’s Notes

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.