[94] Plat. Euthydem. pp. 283, 284 (pp. 416-418).

[95] Ibid. p. 298 (p. 446).

[96] Xenoph. Memorab. II. c. 1, § 21 seq.

[97] Diog. Laert. IX. 50.

[98] Ibid. 54.

[99] Plat. Protag. p. 338 fin. (p. 204).

[100] Plutarch in Pericle, c. 36.

[101] Diog. Laërt. IX. 51, 52; 55, 56 (Sext. Empir. adv. Math. IX. 56).

[102] Plat. Theætet. p. 152 (p. 195); Sext. Emp. Pyrrh. Hyp. I, c. 32, § 216.

[103] Sext. Empir. adv. Math. VII. 388, 60; Plat. Theætet. p. 152. (p. 195-197).