11Though not used by the people of Italy, it seems proper that I should explain the form of the palæstra, and describe the mode in which it was constructed by the Greeks. The square or oblong peristylia of palestræ, have a walk round them which the Greeks call δίαυλος, two stadia in circuit: three of the sides are single porticos: the fourth, which is that on the south side, is to be double, so that when showers fall in windy weather, the drops may not drive into the inner part of it.
11Next, although the building of palaestrae is not usual in Italy, I think it best to set forth the traditional way, and to show how they are constructed among the Greeks. The square or oblong peristyle in a palaestra should be so formed that the circuit of it makes a walk of two stadia, a distance which the Greeks call the δἱανλος. Let three of its colonnades be single, but let the fourth, which is on the south side, be double, so that when there is bad weather accompanied by wind, the drops of rain may not be able to reach the interior.