Note 279 — CANTO THE THIRD.
Reading edition
["The metaphor is derived from a torrent-bed, which, when dried up, serves for a sandy or shingly path."—Note by H. F. Tozer, Childe Harold, 1885, p. 257. Or, perhaps, the imagery has been suggested by the action of a flood, which ploughs a channel for itself through fruitful soil, and, when the waters are spent, leaves behind it "a sterile track," which does, indeed, permit the traveller to survey the desolation, but serves no other purpose of use or beauty.]