[329]. See note (7), p. [310].

[330]. Reading ᾀἱδίου, with Emperius.

[331]. Ion Chius, Fr. 57 (Nauck).

[332]. Reading διίησιν, with Madvig.

[333]. I have followed the paraphrase of the Greek words suggested by Wyttenbach. For the physical facts see Ganot’s Physics, 516.

[334]. Timaeus, 46 A-C (Plato does not discuss plane folding mirrors).

[335]. Reading χωρεῖν for χωροῦντες.

[336]. Kepler has supplied such a diagram (in his translation, p. 131).

[337]. See p. [253].

[338]. Pindar, Fr. 107. Paean 9 (see Oxy. Pap. 1908, 841).