Chapter LXXXIV: Section XLI: Farther. While the sculptures of the incrusted school will

thus be generally distinguished by care and purity rather than force, and will be, for the most part, utterly wanting in depth of shadow, there will be one means of obtaining darkness peculiarly simple and obvious, and often in the sculptor's power. Wherever he can, without danger, leave a hollow behind his covering slabs, or use them, like glass, to fill an aperture in the wall, he can, by piercing them with holes, obtain points or spaces of intense blackness to contrast with the light tracing of the rest of his design. And we may expect to find this artifice used the more extensively, because, while it will be an effective means of ornamentation on the exterior of the building, it will be also the safest way of admitting light to the interior, still totally excluding both rain and wind. And it will naturally follow that the architect, thus familiarized with the effect of black and sudden points of shadow, will often seek to carry the same principle into other portions of his ornamentation, and by deep drill-holes, or perhaps inlaid portions of black color, to refresh the eye where it may be wearied by the lightness of the general handling.

SECTION XLII. Farther. Exactly in proportion to the degree in which the force of sculpture is subdued, will be the importance attached to color as a means of effect or constituent of beauty. I have above stated that the incrusted style was the only one in which perfect or permanent color decoration was _possible_. It is also the only one in which a true system of color decoration was ever likely to be invented. In order to understand this, the reader must permit me to review with some care the nature of the principles of coloring adopted by the Northern and Southern nations.