Flamboyant Gothic was essentially a decorative art. Therein only did it differ from preceding schools, for it developed no new principles of construction. Because of the flamelike undulations of its window tracery, the Norman archæologist, M. de Caumont, who had brought into use the name Romanesque, invented the equally useful term Flamboyant.[141] Capricious, overladen, disturbingly restless, this final phase of the national art may often be (it has been called more terrestrial than celestial), it was inclined to exhibit its technical dexterity; but none the less it was keenly alive and a vast improvement on the over-formalized geometric Rayonnant Gothic to which it succeeded. In both, the profiles were prismatic, fluid, and weak. Discipline which made for robustness was forever lost. A century before the characteristics of Flamboyant art developed in France, they were in use in England, and there called Curvilinear or Decorated Gothic. Window mullions undulated, arches were crowned with reversed curves and sculptured finials, secondary, connecting ribs were added to the vaulting, bases were elongated, there were interpenetrating molds, hanging keystones, piers without capitals, and such new models for foliate sculpture as the deeply indented leaves of parsley and curly cabbage. When capitals were given up, the ribs died away weakly in the piers. The Gothic of England had changed to its cold Perpendicular phase by the time that the architects across the Channel adopted the features called Flamboyant in France. M. Camille Enlart has developed the idea that the last phase of the national architecture was a product of the English occupation during the Hundred Years' War, that from elements of decoration introduced by England, the French composed a style which differed somewhat only from that in vogue across the Channel from 1300 to 1360. In France, flowing tracery and ogee arches were not used before 1375. France need feel no diminution of her claim of leadership in Gothic architecture because she adopted, for her XV-century traits, certain decorative details developed first by others, since the Gothic of England was originally of French derivation. The theory of an English origin for French Flamboyancy is contested by M. Anthyme Saint-Paul, who thought that from the same elements of XIII-century Gothic one country developed its own Curvilinear style and the other its own, Flamboyant Gothic.[142] M. de Lasteyrie agreed with the thesis that there is a French origin for French late-Gothic manifestations. That Flamboyant art is in part indigenous and partly of foreign derivation is probably nearest the truth. Certainly sporadic cases of florid features appeared in French art during the XIII and XIV centuries, but it is clear that in various places long held by the English there appeared the first or the fullest expression of late-Gothic art.