stand over the nine below, having, like them, the ninth central one largest. But on their flanks, where is the slope of the shoulder-like pediment, the arches vanish, and a wedge-shaped frieze takes their place, tapering outwards, in order to allow the columns to be carried to the extremity of the pediment; and here, where the heights of the shafts are so fast shortened, they are set thicker; five shafts, or rather four and a capital, above, to four of the arcade below, giving twenty-one intervals instead of nineteen. In the next or third arcade—which, remember, is the highest—eight arches, all equal, are given in the space of the nine below, so that there is now a central shaft instead of a central arch, and the span of the arches is increased in proportion to their increased height. Finally, in the uppermost arcade, which is the lowest of all, the arches, the same in number as those below, are narrower than any of the façade; the whole eight going very nearly above the six below them, while the terminal arches of the lower arcade are surmounted by flanking masses of decorated wall with projecting figures.
XIII. Now I call that Living Architecture. There is sensation in every inch of it, and an accommodation to every architectural necessity, with a determined variation in arrangement, which is exactly like the related proportions and provisions in the structure of organic form. I have not space to examine the still lovelier proportioning of the external shafts of the apse of this marvellous building. I prefer, lest the reader should think it a peculiar example, to state the structure of another church, the most graceful and grand piece of Romanesque work, as a fragment, in north Italy, that of San Giovanni Evangelista, at Pistoja.
The side of that church has three stories of arcade, diminishing in height in bold geometrical proportion, while the arches, for the most part, increase in number
