Punctuation, hyphenation, and spelling were made consistent when a predominant preference was found in the original book; otherwise they were not changed.

Simple typographical errors were corrected; unbalanced quotation marks were remedied when the change was obvious, and otherwise left unbalanced.

Original text uses “loadstone”, not “lodestone”.

Footnotes, originally at the bottoms of pages, have been collected and moved to the end of this eBook.

Page 22: The symbol in “Locus sigilli” is a version of a Maltese cross.

Footnote 4, originally on page 27, is a sub-note of footnote 3.