Full page figures have been moved near to the text they illustrate. Figures in the text have been moved to the start or end of the paragraph.

Footnotes have been moved to the end of chapters.

Variant spelling and inconsistent hyphenation are retained, in a few cases, missing punctuation has been added for consistency, e.g. to match quotation marks. A few palpable printing errors have been corrected.

Other changes that have been made are listed at the end of the book.