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4He who is desirous that this may not happen to his work, should build his two face walls two feet thick either of red stone or of brick or common flint, binding them together with iron cramps run with lead, and duly preserving the middle space or cavity. The materials, in this case, not being thrown in at random, but the work well brought up on the beds, the upright joints properly arranged, and the face walls, moreover, regularly tied together, they are not liable to bulge, nor be otherwise disfigured.
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