PLATE V.--Door of the Baptistery at Pisa. The reader must note that, although these plates are necessarily, in fineness of detail, inferior to the photographs from which they are taken, they have the inestimable advantage of permanence, and will not fade away into spectres when the book is old. I am greatly puzzled by the richness of the current ornamentation on the main pillars, as opposed to the general severity of design. I never can understand how the men who indulged in this flowing luxury of foliage were so stern in their masonry and figure-draperies. PLATE VI.--Part of the lintel of the door represented on Plate V., enlarged. I intended, in the Lecture on Marble Couchant, to have insisted, at some length, on the decoration of the lintel and side-posts, as one of the most important phases of mystic ecclesiastical sculpture. But I find the materials furnished by Lucca, Pisa, and Florence, for such an essay are far too rich to be examined cursorily; the treatment even of this single lintel could scarcely be enough explained in the close of the Lecture. I must dwell on some points of it now. Look back to Section 175 in "Aratra Pentelici," giving statement of the four kinds of relief in sculpture. The uppermost of these plinths is of the kind I have called 'round relief'; you might strike it out on a coin. The lower is 'foliate relief'; it looks almost as if the figures had been cut out of one layer of marble, and laid against another behind it. The uppermost, at the distance of my diagram, or in nature itself, would scarcely be distinguished at a careless glance from an egg-and-arrow moulding. You could not have a more simple or forcible illustration of my statement in the first chapter of "Aratra," that the essential business of sculpture is to produce a series of agreeable bosses or rounded surfaces; to which, if possible, some meaning may afterwards be attached. In the present instance, every egg becomes an angel, or evangelist, and every arrow a lily, or a wing. [1] The whole is in the most exquisitely finished Byzantine style. [Footnote: In the contemporary south door of the Duomo of Genoa, the Greek moulding is used without any such transformation.] I am not sure of being right in my interpretation of the meaning of these figures; but I think there can be little question about it. There are eleven altogether; the three central, Christ with His mother and St. Joseph; then, two evangelists, with two alternate angels, on each side. Each of these angels carries a rod, with a fleur-de-lys termination; their wings decorate the intermediate ridges (formed, in a pure Greek moulding, by the arrows); and, behind the heads of all the figures, there is now a circular recess; once filled, I doubt not, by a plate of gold. The Christ, and the Evangelists, all carry books, of which each has a mosaic, or intaglio ornament, in the shape of a cross. I could not show you a more severe or perfectly representative piece of _architectural_ sculpture.