Now, it is evident, that, in this case, the question of right is on the same ground as in that of gilding. If it be clearly understood that a marble facing does not pretend or imply a marble wall, there is no harm in it; and as it is also evident that, when very precious stones are used, as jaspers and serpentines, it must become, not only an extravagant and vain increase of expense, but sometimes an actual impossibility, to obtain mass of them enough to build with, there is no resource but this of veneering; nor is there anything to be alleged against it on the head of durability, such work having been by experience found to last as long, and in as perfect condition, as any kind of masonry. It is, therefore, to be considered as simply an art of mosaic on a large scale, the ground being of brick, or any other material; and when lovely stones are to be obtained, it is a manner which should be thoroughly understood, and often practised. Nevertheless, as we esteem the shaft of a column more highly for its being of a single block, and as we do not regret the loss of substance and value which there is in things of solid gold, silver, agate, or ivory; so I think the walls themselves may be regarded with a more just complacency if they are known to be all of noble substance; and that rightly weighing the demands of the two principles of which we have hitherto spoken--Sacrifice and Truth, we should sometimes rather spare external ornament than diminish the unseen value and consistency of what we do; and I believe that a better manner of design, and a more careful and studious, if less abundant decoration would follow, upon the consciousness of thoroughness in the substance. And, indeed, this is to be remembered, with respect to all the points we have examined; that while we have traced the limits of license, we have not fixed those of that high rectitude which refuses license. It is thus true that there is no falsity, and much beauty in the use of external color, and that it is lawful to paint either pictures or patterns on whatever surfaces may seem to need enrichment. But it is not less true, that such practices are essentially unarchitectural; and while we cannot say that there is actual danger in an over use of them, seeing that they have been _always_ used most lavishly in the times of most noble art, yet they divide the work into two parts and kinds, one of less durability than the other, which dies away from it in process of ages, and leaves it, unless it have noble qualities of its own, naked and bare. That enduring noblesse I should, therefore, call truly architectural; and it is not until this has been secured that the accessory power of painting may be called in, for the delight of the immediate time; nor this, as I think, until every resource of a more stable kind has been exhausted. The true colors of architecture are those of natural stone, and I would fain see these taken advantage of to the full. Every variety of hue, from