Biscornette was a very mysterious worker, and no one ever saw him constructing the hinges. Reports went round that the devil was helping him, that he had sold his soul to the King of Darkness in order to enlist his assistance in his work; an instance of aesthetic altruism almost commendable in its exotic zeal. Certain jealous artificers even went so far as to break off bits of the meandering iron, to test it, but with no result; they could not decide whether it was cast or wrought. Later a legend grew up explaining the reason why the central door was not as ornate as the side doors: the story was that the devil was unable to assist Biscornette on this door because it was the aperture through which the Host passed in processions. It is more likely, however, that the doors were originally uniform, and that the iron was subsequently removed for some other reason. The design is supposed to represent the Earthly Paradise. Sauval says: "The sculptured birds and ornaments are marvellous. They are made of wrought iron, the invention of Biscornette and which died with him. He worked the iron with an almost incredible industry, rendering it flexible and tractable, and gave it all the forms and scrolls he wished, with a 'douceur et une gentillesse' which surprised and astonished all the smiths." The iron master Gaegart broke off fragments of the iron, and no member of the craft has ever been able to state with certainty just how the work was accomplished. Some think that it is cast, and then treated with the file; others say that it must have been executed by casting entire, with no soldering. In any case, the secret will never be divulged, for no one was in the confidence of Biscornette. Norman blacksmiths and workers in wrought iron were more plentiful than goldsmiths. They had, in those warlike times, more call for arms and the massive products of the forge than for gaudy jewels and table appointments. One of the doors of St. Alban's Abbey displays the skill of Norman smiths dealing with this stalwart form of ornament. Among special artists in iron whose names have survived is that of Jehan Tonquin, in 1388. Earlier than that, a cutler, Thomas de Fieuvillier, is mentioned, as having flourished about 1330. [Illustration: BISCORNETTE'S DOORS AT PARIS] Elaborate iron work is rare in Germany; the Germans always excelled rather in bronze than in the sterner metal. At St. Ursula's in Cologne there are iron floriated hinges, but the design and idea are French, and not native. One may usually recognize a difference between French and English wrought iron, for the French is often in detached pieces, not an outgrowth of the actual hinge itself, and when this is found in England, it indicates French work.