Dashes used to represent duplicated entries in the Index have been replaced by the text they represent.

Some Plates containing multiple illustrations and photographs were marked in the original with numbers. In some cases, these numbers have been replaced by larger numbers for readability. Numbers were also added to figures and the corresponding captions in some cases in order to improve readability.

Some presumed printer's errors have been corrected. In particular, punctuation has been normalized. Spelling in the Index has been corrected to match the spelling in the main text. Additional corrections are listed below with the text as printed (top) and the corrected text (bottom):