Transcriber’s Notes
Reading edition
Silently corrected a few typos.
Retained publication information from the printed edition: this eBook is public-domain in the country of publication.
In the text versions only, text in italics is delimited by _underscores_.
Changed some input instructions to better fit radiobutton or checkbox functionality.
In the HTML version only, data entry is supported, but input is not preserved across browser refreshes; it can be recorded by printing the file or saving the viewer screen.