this ruling form has been secured; and in the boughs that approach the spectator, the foreshortening of it is like that of a wide hill country, ridge just rising over ridge in successive distances; and the finger-like extremities, foreshortened to absolute bluntness, require a delicacy in the rendering of them like that of the drawing of the hand of the Magdalene upon the vase in Mr. Rogers's Titian. Get but the back of that foliage, and you have the tree; but I cannot name the artist who has thoroughly felt it. So, in all drawing and sculpture, it is the power of rounding, softly and perfectly, every inferior mass which preserves the serenity, as it follows the truth, of Nature, and which demands the highest knowledge and skill from the workman. A noble design may always be told by the back of a single leaf, and it was the sacrifice of this breadth and refinement of surface for sharp edges and extravagant undercutting, which destroyed the Gothic mouldings, as the substitution of the line for the light destroyed the Gothic tracery. This change, however, we shall better comprehend after we have glanced at the chief conditions of arrangement of the second kind of mass; that which is flat, and of shadow only. [Illustration: PLATE VI.--(Page 90--Vol. V.) ARCH FROM THE FAÇADE OF THE CHURCH OF SAN MICHELE AT LUCCA.] XVIII. We have noted above how the wall surface, composed of rich materials, and covered with costly work, in modes which we shall examine in the next Chapter, became a subject of peculiar interest to the Christian architects. Its broad flat lights could only be made valuable by points or masses of energetic shadow, which were obtained by the Romanesque architect by means of ranges of recessed arcade, in the management of which, however, though all the effect depends upon the shadow so obtained, the eye is still, as in classical architecture, caused to dwell upon the projecting columns, capitals, and wall, as in Plate VI. But with the enlargement of the window, which, in the Lombard and Romanesque churches, is usually little more than an arched slit, came the conception of the simpler mode of decoration, by penetrations which, seen from within, are forms of light, and, from without, are forms of shade. In Italian traceries the eye is exclusively fixed upon the dark forms of the penetrations, and the whole proportion and power of the design are caused to depend upon them. The intermediate spaces are, indeed, in the most perfect early examples, filled with elaborate ornament; but this ornament was so subdued as never to disturb the simplicity and force of the dark masses; and in many instances is entirely wanting. The composition of the whole depends on the proportioning and shaping of the darks; and it is impossible that anything can be more exquisite than their placing in the head window of the Giotto campanile, Plate IX., or the church of Or San Michele. So entirely does the effect depend upon them, that it is quite useless to