Changes made to the text (in the case of typographical errors) are as
follows:
Page 66: added missing semi-colon ("... terminated in the fore part by
the plough-share; ...")
Page 83: changed "grea" to "great" ( ... except the perfect flatness and
great breadth of the surface of each, ...)
Page 158 (Footnote [36]) changed period to comma after page reference
(... see _p. 130_, that "it was a trifle not worth thinking about.")
Page 167 deleted spurious apostrophe after "winter" (... that they might
have a supply of it during the winter frosts?)
Page 192 changed "Where-ever" to "Wherever" (Wherever these hillocks
abounded, ...)