capital is proportionately increased and its breadth[2] is
correspondingly enlarged.

[Note 2: Codd. _altitudo_.]

8. With regard to the method of describing volutes, at the end of the
book a figure will be subjoined and a calculation showing how they may
be described so that their spirals may be true to the compass.

The capitals having been finished and set up in due proportion to the
columns (not exactly level on the columns, however, but with the same
measured adjustment, so that in the upper members there may be an
increase corresponding to that which was made in the stylobates), the
rule for the architraves is to be as follows. If the columns are at
least twelve feet and not more than fifteen feet high, let the height of
the architrave be equal to half the thickness of a column at the bottom.
If they are from fifteen feet to twenty, let the height of a column be
measured off into thirteen parts, and let one of these be the height of
the architrave. If they are from twenty to twenty-five feet, let this
height be divided into twelve and one half parts, and let one of them
form the height of the architrave. If they are from twenty-five feet to
thirty, let it be divided into twelve parts, and let one of them form
the height. If they are higher, the heights of the architraves are to be
worked out proportionately in the same manner from the height of the
columns.

9. For the higher that the eye has to climb, the less easily can it make
its way through the thicker and thicker mass of air. So it fails when
the height is great, its strength is sucked out of it, and it conveys to
the mind only a confused estimate of the dimensions. Hence there must
always be a corresponding increase in the symmetrical proportions of the
members, so that whether the buildings are on unusually lofty sites or
are themselves somewhat colossal, the size of the parts may seem in due
proportion. The depth of the architrave on its under side just above the
capital, is to be equivalent to the thickness of the top of the column
just under the capital, and on its uppermost side equivalent to the foot
of the shaft.

10. The cymatium of the architrave should be one seventh of the height
of the whole architrave, and its projection the same. Omitting the
cymatium, the rest of the architrave is to be divided into twelve parts,
and three of these will form the lowest fascia, four, the next, and
five, the highest fascia. The frieze, above the architrav