The mortise-lock now in use in England and America first made its appearance toward the end of the eighteenth century in England, where it displaced the brass or iron box-lock; but on the Continent it has never been adopted. It is a poor substitute for the box-lock, since it not only weakens but disfigures the door, while a well-designed box-lock is both substantial and ornamental (see Plate XVII).
In many minds the Louis XV period is associated with a general waviness of line and excess of carving. It has already been pointed out that even when the rocaille manner was at its height the main lines of a room were seldom allowed to follow the capricious movement of the ornamental accessories. Openings being the leading features of a room, their main lines were almost invariably respected; and while considerable play of movement was allowed in some of the accessory mouldings of the over-doors and over-mantels, the plan of the panel, in general symmetrical, was in many cases a plain rectangle.[16]
During the Louis XV period the panelling of doors was frequently enriched with elaborate carving; but such doors are to be found only in palaces, or in princely houses like the Hôtels de Soubise, de Rohan, or de Toulouse (see Plate XVIII). In the most magnificent apartments, moreover, plain panelled doors were as common as those adorned with carving; while in the average private hôtel, even where much ornament was lavished on the panelling of the walls, the doors were left plain.
Towards the close of this reign, when the influence of Gabriel began to simplify and restrain the ornamental details of house-decoration, the panelled door was often made without carving and was sometimes painted with attenuated arabesques and grisaille medallions, relieved against a gold ground. Gabriel gave the key-note of what is known as Louis XVI decoration, and the treatment of the door in France followed the same general lines until the end of the eighteenth century. As the classic influence became more marked, paintings in the over-door and over-mantel were replaced by low or high reliefs in stucco: and towards the end of the Louis XVI period a processional frieze in the classic manner often filled the entablature above the architrave of the door (see Plate XVI).