[370], l. 7, for “feet,” read “per cent.”

[376], for “19090,” read “19050.”

[384], in last part of example, for “5280
4½ × 3.1416 × 4 = 37300,” read “25 × 5280
4 × 3.1416 × 4 = 37348.”

[421], bottom line, for “decision,” read “division.”

[423] and [424], in table, for “count,” read “cost.”

[427], l. 32, for “which,” read “we.”

[428], l. 4, transpose “Dr. Lardner, (1850,)” to the end of line 3.

[443], l. 28, for “valuation,” read “solution.”

[446], l. 11, for “attained,” read “obtained.”

[459], l. 20, for “Hectametre,” read “Hectometre.”