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3If the doors are Ionic, their height is to be regulated as in those that are Doric. Their width is found by dividing the height into two parts and a half, and taking one and a half for the width below. The diminution is to be as in the Doric door-way. The width of the dressings is to be a fourteenth part of the height of the aperture; the cymatium a sixth part of their width; the remainder, deducting the cymatium, is to be divided into twelve parts, three of which are given to the first fascia, with the astragal, four to the second, and five to the third. The fasciæ, with the astragal, run quite round the dressings.
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