church's being built of marble is, in nearly all cases, only that a veneering of marble has been fastened on the rough brick wall, built with certain projections to receive it; and that what appear to be massy stones, are nothing more than external slabs.
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 any thing 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 that 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
