Sabine Baring-Gould,
In Troubadour-Land — Chapter I: Introductory
(1891)
“ Now Rome is tunnelled under the streets with drains or sewers that carry all the refuse of a great city into the Tiber. But, naturally, when the Tiber swells high above the crowns of the sewers, they are choked. All the foulness of the great town is held back under the houses and streets, and breeds gases loathsome to the nose and noxious to life. ”
