Now, though the walls are thick, there are no buttresses, and the skill and daring required to build a vault sixty-five feet wide and about a hundred feet high resting on side walls on one side and on piers scarcely six feet thick on the other must not only excite the admiration of every one, especially when it is remembered that no damage was caused by the great earthquake which shook Lisbon to pieces in 1755, but must also raise the wish that what has been so skilfully done here had been also done in the Capellas Imperfeitas at Batalha. At the north end of the main transept are two doors, one leading to the cloister and one to the sacristy. A straight and curved moulding surrounds their trefoil heads under a double twining hood-mould. Outside, other mouldings rise high above the whole to form a second large trefoil, whose hood-mould curves into two great crocketed circles before rising to a second ogee. The chancel has a round and the chapels pointed entrance arches, formed, as are the jambs, of two bands of carving and two thick twisted mouldings. Tomb recesses, added later, with strapwork pediments line the chapels, and at the entrance to the chancel are two pulpits, for the Gospel and Epistle. These are rather like João de Ruão's pulpit at Coimbra in outline, but supported on a large capital are quite Gothic, as are the large canopies which rise above them. Strong arches with cable mouldings lead to the space under the gallery, which is supported by an elaborate vault, elliptical in the central and pointed in the side aisles. In the gallery itself--only to be entered from the upper cloister--are the choir stalls, of Brazil wood, added in 1560, perhaps from the designs of Diogo da Carta.[134] With the earlier stalls at Santa Cruz and at Funchal, and the later at Evora, these are almost the only ones left which have not been replaced by rococo extravagances. The back is divided into large panels three stalls wide, each containing a painting of a saint, and separated by panelled and carved Corinthian pilasters. Below each painting is an oblong panel with, in the centre, a beautifully carved head looking out of a circle, and at the sides bold carvings of leaves, dragons, sirens, or animals, while beautiful figures of saints stand in round-headed niches under the pilasters. At the ends are larger pilasters, and a cornice carried on corbels serves as canopy. Each of the lower stalls has a carved panel under the upper book-board, but the small figures which stood between them on the arms are nearly all gone. If 1560 be the real date, the carving is extraordinarily early in character; the execution too is excellent, though perhaps the heads under the paintings are on too large a scale for woodwork, still they are not at all coarse, and would be worthy of the best Spanish or French sculptors.