--Retained the copyright notice from the printed edition (although
this book is in the public domain.)
--Silently corrected a few palpable typos.
--In the text versions only, delimited italicized text in
_underscores_.
--In the table of distances travelled, abbreviated column headings
to save space, and added a key to the abbreviations.
--Re-ordered the table of illustrations to match the order of
illustrations in the text.