Except when index entries did not match the body of the text, irregularities in capitalization and hyphenation have not been corrected. Alternate spellings (e.g. Ogilvy vs. Ogilvie), possible errors in quoted passages (e.g. remembraance), and mathematical errors have not been changed or corrected.
Minor punctuation errors (e.g. missing or extra quotation marks, extra commas) have been corrected without note.
Footnote markers have been changed from symbols to numbers. Tables spanning more than one page in the original book have been joined and the "Carried Forward" and "Brought Forward" rows removed.
The following corrections and changes were also made:
- [p. 70]: Ἐικονα to Εἰκονα
- [p. 211]: moved footnote marker in table from before "Workhouses and elsewhere" to after
- [p. 263]: mantenance to maintenance (the average weekly cost of maintenance)
- [p. 304]: Etvy to Etoy
- [p. 308] and pp. [537], [538] (Index): Boldovan to Baldovan, and moved index entry to correct alphabetical order
- [p. 340]: aslyums to asylums (lunatics and lunatic asylums)
- [p. 356]: Kircudbrightshire to Kirkcudbrightshire
- [p. 394]: Clonwell to Clonmel (Clonmel Asylum)
- [p. 444]: pychologists to psychologists (celebrated psychologists)
- [p. 489]: apostrophe removed from "Haywards" (Haywards Heath Asylum)
- [p. 494]: igorance to ignorance (ignorance and fear)
- [p. 533]: chapter v to chapter vi (See chapter vi.)
- [p. 538]: 1858, 1859, 191, 259; to 1858, 191; 1859, 259; (Index entry for "Census of insane")
- [p. 539]: Colebrook to Colebrooke (Index entry)
- [p. 541]: Stoughton to Staughton (Index entry for "Great Staughton")
- [p. 543]: 553 to 355 (Index entry for "McNeill, Sir John")
- [p. 544]: Nicolin to Niolin, and moved to correct alphabetical order (Index entry for "Niolin, red")
- [p. 546]: added C. (Index entry for "Smith, Mr. C. Roach")
- [p. 546]: Thomas's to Thomas' (Index entry for "St. Thomas' Asylum")
- [p. 547]: Trelat to Trélat (Index entry)
- [p. 548]: moved Index entry for "Willes, Mr. Justice" to correct alphabetical order (originally between "Willis, Dr." and "Windmill Hill")