The original clerestory still, in great part, remains; it is simple, but good and vigorous in style, and with but one special peculiarity in its detail. The windows are for the most part of two lights, with a quatrefoiled circle in the head; and the peculiarity referred to here is the omission to carry the chamfer round the extrados of the arched heads to the lights or the circle; the effect produced is peculiar, the tracery not looking as if it were properly constructed, but as if the wheel had been loosely placed within the arch without having any proper connection with it. I have noticed the same arrangement in a church at Valladolid, and it must, I think, be regarded either as a freak of the workmen, or more probably as the exhibition of some degree of ignorance of the ordinary mode of executing the mouldings in window traceries. But here, with this one exception, as in almost all the details throughout the original work of this cathedral, there is little, if anything, to show that we are not in France, and looking at some of its best and purest thirteenth-century Gothic. There is no trace of Moorish or other foreign influence, the whole work being pure, simple, and good. In the aisles two only of the original windows still remain, and these show that they were lighted originally by a series of well-shaped lancets, with engaged jamb-shafts inside. The vaults are all slightly domical in section; the diagonal ribs generally semi-circular, as also are the wall-ribs. The masonry of the cells is arranged in lines parallel to the ridge, but considerably distorted near the springing. The transepts, which, as has been said, are similar in their design to the nave, are of considerable size, and the view across them is in fact the best internal view in the church. One early chapel alone remains,--on the east side of the north transept,--and its groined roof is remarkable. It is a square in plan, with its vault divided into eight groining cells, forming two bays on each side, and with two lancet windows at the east end, each under a division of the vault. No one who has studied the groining of the churches in Poitou and Anjou--so decided in their local peculiarities--can doubt, on comparison of them with this chapel, that it was the work of men who had studied in the same school, and it is remarkable that we find it reproduced in the lantern of the great church of the Convent of Las Huelgas, near Burgos, of which I shall presently have to speak. In both cases the vaulting is very domical, and the joints of the stone filling-in of the cells are _vertical_. This chapel suggests, too, the question whether the first idea was not here, as well as at Las Huelgas, to have a series of chapels on the east side of the transepts, though I should decide this in the negative, inasmuch as there is no mark of a chapel in the next bay to the north, and there was probably from the first a complete chevet to the choir.