placed to correspond to the centre of each
corner and intermediate column, and two over each intercolumniation
except the middle intercolumniations of the front and rear porticoes,
which have three each. The intervals in the middle being thus extended,
a free passage will be afforded to those who would approach the statues
of the gods.

[Illustration: VITRUVIUS' DORIC ORDER COMPARED WITH THE TEMPLE AT CORI
AND THE DORIC ORDER OF THE THEATRE OF MARCELLUS]

5. The width of the triglyph should be divided into six parts, and five
of these marked off in the middle by means of the rule, and two half
parts at the right and left. Let one part, that in the centre, form a
"femur" (in Greek [Greek: meros]). On each side of it are the channels,
to be cut in to fit the tip of a carpenter's square, and in succession
the other femora, one at the right and the other at the left of a
channel. To the outsides are relegated the semichannels. The triglyphs
having been thus arranged, let the metopes between the triglyphs be as
high as they are wide, while at the outer corners there should be
semimetopes inserted, with the width of half a module.

In these ways all defects will be corrected, whether in metopes or
intercolumniations or lacunaria, as all the arrangements have been made
with uniformity.

6. The capitals of each triglyph are to measure one sixth of a module.
Over the capitals of the triglyphs the corona is to be placed, with a
projection of two thirds of a module, and having a Doric cymatium at the
bottom and another at the top. So the corona with its cymatia is half a
module in height. Set off on the under side of the corona, vertically
over the triglyphs and over the middle of the metopes, are the viae in
straight lines and the guttae arranged in rows, six guttae broad and
three deep. The spaces left (due to the fact that the metopes are
broader than the triglyphs) may be left unornamented or may have
thunderbolts carved on them. Just at the edge of the corona a line
should be cut in, called the scotia. All the other parts, such as
tympana and the simae of the corona, are to be constructed as described
above in the case of the Ionic order.

7. Such will be the scheme established for diastyle buildings. But if
the building is to be systyle and monotriglyphic, let the front of the
temple, if tetrastyle, be divided into nineteen and a half parts; if
hexastyle, into twenty-nine and a half parts. One of these parts will
form