[17] Report of House of Lords Committee on Conservancy Boards, 1877.
[18] Report of Select Committee on Canals, 1883.
[19] Herodotus, lib. ii. c. lxlix.
[20] Diodorus Siculus, lib. i. c. iv.
[21] Strabo, lib. xvii.
[22] Diodorus Siculus, lib. i. c. i.
[23] Cresy’s ‘Encyclopædia of Civil Engineering,’ c. iv.
[24] The railway starts from Callao at a height of 448 ft. above sea level, and at 104½ miles distance it passes through the summit tunnel at a height of 15,645 ft. above that level.
[25] ‘Practical Treatise on Railroads,’ third edition, p. 684.
[26] Observations on a late publication ‘The Present State of the Nation,’ Bohn’s series, vol. i. p. 198.