6Marble is not alike in all countries. In some places it contains pellucid particles, similar to those of salt, which, when bruised and ground, impart great solidity to plastering and cornices. When these are not to be obtained, the chips (assulæ), as they are denominated, which the workers in marble throw off in working, may be substituted after being pounded and sifted. They are to be separated into three sorts, of which that which contains the larger particles, is, as we have above directed, to be laid on with the sand and lime: then follows the second coat, and afterwards, the third which is finer in texture. After this preparation, and a careful polishing of the work, the colours which it is to receive are to be considered, so that they may be brilliant. Their variety and the method of preparing them will be found in the following pages.