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

Simple typographical errors were corrected; occasional unbalanced quotation marks retained; inconsistent hyphenation retained.

Ambiguous hyphens at the ends of lines were retained.

Page 146: Quotation mark preceding 'The sale value' has no matching closing mark.

Page 192: "Stetefelt's" is spelled "Stetefeldt" on page 129. The latter is correct.

Page 192: "Tycho Brahe" probably should be indexed as "Brahe, Tycho".