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3The arches being prepared and interwoven with the reeds, a coat is to be laid on the underside. The sand is afterwards introduced on it, and it is then polished with chalk or marble. After polishing, the cornices are to be run along the springing: they are to be as slender and light as possible; for, when large, they settle by their own weight, and are incapable of sustaining themselves. But little plaster should be used in them, and the stuff should be of uniform quality, such as marble-dust; for the former, by setting quickly, does not allow the work to dry of one consistence. The practice of the antients, in arched ceilings, is also to be avoided; for their cornices are dangerous, from their great projection and consequent weight.
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