the columns round the cella be arranged in the symmetrical proportions just given.
3. The proportions of the roof in the centre should be such that the height of the rotunda, excluding the finial, is equivalent to one half the diameter of the whole work. The finial, excluding
THE CIRCULAR TEMPLE ACCORDING TO VITRUVIUS
its pyramidal base, should have the dimensions of the capital of a column. All the rest must be built in the symmetrical proportions described above.
4. There are also other kinds of temples, constructed in the same symmetrical proportions and yet with a different kind of plan: for example, the temple of Castor in the district of the Circus Flaminius, that of Vejovis between the two groves, and still more ingeniously the temple of Diana in her sacred grove, with columns added on the right and left at the flanks of the pronaos. Temples of this kind, like that of Castor in the Circus, were first built in Athens on the Acropolis, and in Attica at Sunium to Pallas Minerva. The proportions of them are not different, but the same as usual. For the length of their cellae is twice the width, as in other temples; but all that we regularly find in the fronts of others is in these transferred to the sides.
