Chapter LXXX: Section XXXVII: LAW VI. The decoration must be shallow in

cutting._ The method of construction being thus systematized, it is evident that a certain style of decoration must arise out of it, based on the primal condition that over the greater part of the edifice there can be _no deep cutting_. The thin sheets of covering stones do not admit of it; we must not cut them through to the bricks; and whatever ornaments we engrave upon them cannot, therefore, be more than an inch deep at the utmost. Consider for an instant the enormous differences which this single condition compels between the sculptural decoration of the incrusted style, and that of the solid stones of the North, which may be hacked and hewn into whatever cavernous hollows and black recesses we choose; struck into grim darknesses and grotesque projections, and rugged ploughings up of sinuous furrows, in which any form or thought may be wrought out on any scale,--mighty statues with robes of rock and crowned foreheads burning in the sun, or venomous goblins and stealthy dragons shrunk into lurking-places of untraceable shade: think of this, and of the play and freedom given to the sculptor's hand and temper, to smite out and in, hither and thither, as he will; and then consider what must be the different spirit of the design which is to be wrought on the smooth surface of a film of marble, where every line and shadow must be drawn with the most tender pencilling and cautious reserve of resource,--where even the chisel must not strike hard, lest it break through the delicate stone, nor the mind be permitted in any impetuosity of conception inconsistent with the fine discipline of the hand. Consider that whatever animal or human form is to be suggested, must be projected on a flat surface; that all the features of the countenance, the folds of the drapery, the involutions of the limbs, must be so reduced and subdued that the whole work becomes rather a piece of fine drawing than of sculpture; and then follow out, until you begin to perceive their endlessness, the resulting differences of character which will be necessitated in every part of the ornamental designs of these incrusted churches, as compared with that of the Northern schools. I shall endeavor to trace a few of them only.