— [237], l. 3 from bottom, for “representing,” read “separating.”
— [241], l. 2, for “localities,” read “locality.”
— [242], l. 7, omit “and c e, the parapets.”
— [243], l. 9, for “embankment,” read “abutment.”
— [244], l. 9, for “is thus,” read “is found thus.”
— [245], l. 17, for “latter,” read “batter.”
— [249], l. 23, for “common hydraulic,” read “common mortar, hydraulic.”
— [249], l. 27, for “argyle magnesia,” read “argil, magnesia.”
— [251], l. 16, for “7½ to 2,” read “1½ to 2.”
— [254], last l., for “corners,” read “courses.”