Those of the earlier times were, in the plurality of instances, composed of alternate square and cylindrical shafts, variously associated and proportioned. Where concave cuttings occur, as in the beautiful west doors of Bayeux, they are between cylindrical shafts, which they throw out into broad light. The eye in all cases dwells on broad surfaces, and commonly upon few. In course of time, a low ridgy process is seen emerging along the outer edge of the cylindrical shaft, forming a line of light upon it and destroying its gradation. Hardly traceable at first (as on the alternate rolls of the north door of Rouen), it grows and pushes out as gradually as a stag's horns: sharp at first on the edge; but, becoming prominent, it receives a truncation, and becomes a definite fillet on the face of the roll. Not yet to be checked, it pushes forward until the roll itself becomes subordinate to it, and is finally lost in a slight swell upon its sides, while the concavities have all the time been deepening and enlarging behind it, until, from a succession of square or cylindrical masses, the whole moulding has become a series of _concavities_ edged by delicate fillets, upon which (sharp _lines_ of light, observe) the eye exclusively rests. While this has been taking place, a similar, though less total, change has affected the flowerwork itself. In Plate I. fig. 2 (_a_), I have given two from the transepts of Rouen. It will be observed how absolutely the eye rests on the forms of the leaves, and on the three berries in the angle, being in light exactly what the trefoil is in darkness. These mouldings nearly adhere to the stone; and are very slightly, though sharply, undercut. In process of time, the attention of the architect, instead of resting on the leaves, went to the _stalks_. These latter were elongated (_b_, from the south door of St. Lo); and to exhibit them better, the deep concavity was cut behind, so as to throw them out in lines of light. The system was carried out into continually increasing intricacy, until, in the transepts of Beauvais, we have brackets and flamboyant traceries, composed of twigs without any leaves at all. This, however, is a partial, though a sufficiently characteristic, caprice, the leaf being never generally banished, and in the mouldings round those same doors, beautifully managed, but itself rendered liny by bold marking of its ribs and veins, and by turning up, and crisping its edges, large intermediate spaces being always left to be occupied by intertwining stems (_c_, from Caudebec). The trefoil of light formed by berries or acorns, though diminished in value, was never lost up to the last period of living Gothic.