Note 106 — Chapter IV · PART I. THE AQUEDUCTS. (continued 2)
Reading edition
The line of this subterranean aqueduct can also be traced by the wells descending into the specus, in the same manner as the Aqua Appia was traced in 1870, that is, by the bushes growing at the top of each of the wells, and generally enclosed by a wooden railing to prevent animals from falling into them.