Ancient and modern engineering and the Isthmian canal
CHAPTER IV.
44. Antiquity of Masonry Aqueducts 52 45. Pont du Gard 52 46. Aqueducts at Segovia, Metz, and other Places 53 47. Tunnels 54 48. Ostia, the Harbor of Rome 56 49. Harbors of Claudius and Trajan 58