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which the small steps on the stylobata produce, whichmust be added to them on the central part of the top ofthe abacus, that the regularity of the epistylia may bepreserved : we may now consider the proportion of theseepistylia, or architraves. When the columns are at leasttwelve and not more than fifteen feet high, the architravemust be half a diameter in height. When they are fromfifteen to twenty feet in height, the height of the columnis to be divided into thirteen parts, and one of themtaken for the height of the architrave. So from twentyto twenty-five feet, let the height be divided into twelveparts and a half, and one part be taken for the height ofthe architrave. Thus, in proportion to the height of thecolumn, is the architrave to be proportioned; alwaysremembering, that the higher the eye has to reach, thegreater is the difficulty it has in piercing the density ofthe air, its power being diminished as the height in-creases ; of which the result is, a confusion of the image.Hence, to preserve a sensible proportion of parts, if inhigh situations, or of colossal dimensions, we mustmodify them accordingly, so that they may appear of thesize intended. The under side of the architrave is tobe as wide as the upper diameter of the column, at thepart under the capital; its upper part equal in width tothe lower diameter of the column. Its cymatium is tobe one-seventh part of the whole height, and its projec-tion the same. After the cymatium is taken out, theremainder is to be divided into twelve parts, three ofwhich are to be given to the lower fascia, four to thenext, and five to the upper one. The zophorus, orfrieze, is placed over the epistylium, than which it mustbe one fourth less in height; but if sculptured, it mustbe one fourth part higher, that the effect of the carvingmay not be injured. Its cymatium is to be a seventhpart of its height, the projection equal to the height.Above the frieze is placed the dentil-band, whose heightmust be equal to that of the middle fascia of the archi-