Spelling inconsistencies were not changed, as several different people
wrote the commentaries.
Simple typographical errors were corrected; unbalanced quotation
marks were remedied when the change was obvious, and otherwise left
unbalanced.
The “SPECIAL NOTICE” and order slip at the end of the book originally
were found between pages 48 and 49. The sheet of paper on which they
were printed appears to have been tipped into the book, not bound, and
was moved so as to not interrupt the flow of the rest of the book.