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18Having explained why, on account of the narrowness of the streets in Rome, walls of brick are not allowed in the city, I shall now give instructions for their use out of the city when required, to the end that they may be durable. On the top of a wall immediately under the roof, there should be a course of burnt bricks, about one foot and a half in height, and projecting over the walls like the corona of a cornice; thus the injury to be guarded against in such a wall, will be prevented; for if any tiles should be accidentally broken or dislodged by the wind, so as to afford a passage for the rain, the burnt brick, a protection to it, will secure the wall itself from damage, and the projection will cause the dropping of the water to fall beyond the face of the wall and thus preserve it.
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