Obvious spelling & typos corrected.
Removed first MACMILLAN AND CO., Ltd., LONDON. from the books on art section as it is redundant.
P. [xix] through [xxi] is a list of updates. Author mostly used "see also" notation in the INDEX LIST OF PAINTERS for the old reference. Added same notation to missed index entries. Added similar "See also" references to the NUMERICAL CATALOGUE. Also updated INDEX LIST OF PICTURES where the author missed.
Moved "Portrait of a Young Man, 1052" from "Milanese School" to "Lombard School (artist unknown)" in INDEX LIST OF PAINTERS to agree with NUMERICAL CATALOGUE & INDEX LIST OF PICTURES.
Moved "Adoration of the Magi, 582" from "Angelico, School of" to "Angelico, Fra, p. [329]" in INDEX LIST OF PAINTERS to agree with NUMERICAL CATALOGUE & INDEX LIST OF PICTURES.
Added "Judgment of Paris, 209" to "Poelenburgh, Cornelis van" in INDEX LIST OF PAINTERS to agree with NUMERICAL CATALOGUE and INDEX LIST OF PICTURES.
Moved "Scene on the Ice, 1850" from "Meulen A. F. van der" to "Vermeulen, Andries" in INDEX LIST OF PAINTERS to agree with NUMERICAL CATALOGUE and INDEX LIST OF PICTURES.
Moved "Interior of a Stable, 1851" from "Meulen A. F. van der" to "Dutch School (artists unknown)" in INDEX LIST OF PAINTERS to agree with NUMERICAL CATALOGUE and INDEX LIST OF PICTURES.