--Retained publisher information from the printed copy (the electronic
edition is in the public domain in the country of publication).
--Corrected some palpable typos, and standardized spelling of some names.
--Collated index against text: corrected spelling but did not remove
spurious entries.
--Corrected “viola pallens” on page 115 to match the index “viola
blanda”.
--In the text versions only, text in italics is delimited by
_underscores_.