The Table of Contents has been added in the electronic version.
Spelling variations were not normalized (“pack horse” and “packhorse”,
“saltpetre” and “saltpeter”).
The following typographical errors were corrected:
title page, period added following “Co”
page 4, “possibilty” changed to “possibility”
page 9, “the the” changed to “the”
page 14, “apppearance” changed to “appearance”
page 29, period added following “1828”
page 31, “His” changed to “his”