there is even a little-known author, but a very creditable one, who says that in a certain castle the Knight of Phoebus was caught in a certain trapdoor that opened beneath his feet, and he fell and found himself in a deep pit under the earth, tied hand and foot, and there he was given one of those things called an enema, composed of melted snow and sand, which almost killed him, and if he had not been helped in those dire straits by a wise man who was a great friend of his, things would have gone very badly for the poor knight.