He tried to visualize her morphing into a wolf, writhing in pain as she transformed, foaming at the mouth, snarling.
A mile and a half northeast are the Falls of Bracklinn (Gaelic, "white-foaming pool"), formed by the Keltie, which takes a leap of 50 ft.
To the accompaniment of hymns, the dance gradually developing into a wild dervish-like spinning which is kept up till they drop, foaming at the mouth and prophesying.
In piercing the Sierra Morena it forms a series of foaming rapids, and only begins to be navigable at Mertola, 42 m.
The pan proper is surmounted by a great cone or hopper called a curb, to provide for the foaming up of the boiling mass and to prevent loss from overflowing.
The "cascades" are wonderful formations like foaming cataracts caught in mid-air and transformed into milk-white or amber alabaster.