Transcriber’s Note

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”