Note A — Canto IV. (continued 2)
Reading edition
A vapour common at sea in bad weather, something larger and rather paler than the light of a candle; which, seeming to rise out of the sea, first moves about the decks, and then ascends or descends the rigging in proportion to the increase or decrease of the storm. Superstition formerly imagined them to be the souls of drowned men.—Freneau's note.