dian porches may be constructed at the ends, as in
the Julia Aquiliana.

5. It is thought that the columns of basilicas ought to be as high as
the side-aisles are broad; an aisle should be limited to one third of
the breadth which the open space in the middle is to have. Let the
columns of the upper tier be smaller than those of the lower, as written
above. The screen, to be placed between the upper and the lower tiers of
columns, ought to be, it is thought, one fourth lower than the columns
of the upper tier, so that people walking in the upper story of the
basilica may not be seen by the business men. The architraves, friezes,
and cornices should be adjusted to the proportions of the columns, as
we have stated in the third book.

[Illustration: _From Mau_

FORUM AT POMPEII

A, Forum. B, Basilica. C, Temple of Apollo. D, D', Market Buildings. E,
Latrina. F, City Treasury. G, Memorial Arch. H, Temple of Jupiter. I,
Arch of Tiberius. K, Macellum (provision market). L, Sanctuary of the
City Lares. M, Temple of Vespasian. N, Building of Eumachia. O,
Comitium. P, Office of the Duumvirs. Q, The City Council. R, Office of
the Aediles.]

6. But basilicas of the greatest dignity and beauty may also be
constructed in the style of that one which I erected, and the building
of which I superintended at Fano. Its proportions and symmetrical
relations were established as follows. In the middle, the main roof
between the columns is 120 feet long and sixty feet wide. Its aisle
round the space beneath the main roof and between the walls and the
columns is twenty feet broad. The columns, of unbroken height, measuring
with their capitals fifty feet, and being each five feet thick, have
behind them pilasters, twenty feet high, two and one half feet broad,
and one and one half feet thick, which support the beams on which is
carried the upper flooring of the aisles. Above them are other
pilasters, eighteen feet high, two feet broad, and a foot thick, which
carry the beams supporting the principal raftering and the roof of the
aisles, which is brought down lower than the main roof.

[Illustration: _From Durm_

PLAN OF THE BASILICA AT POMPEII]

7. The spaces remaining between the beams supported by the pilasters and
the columns, are left for windows between the intercolumniations. The
columns are: on the breadth of the main roof at each end, four,
including the corner columns at right and left; on the long side which
is next to the