[168] Sext. Empir. Pyrrh. Hyp. I. c. 33, § 220.
[169] Diog. Laërt. IV. 28-33, 36-38, 42, 44; Bruck. Hist. crit. phil. T. I. p. 746; Tennemann, Vol. IV. p. 443; Cic. De finib. II. 1.
[170] Sext. Empir. Pyrrh. Hyp. I. c. 33, § 232; Diog. Laërt. IV. 32.
[171] Sext. Empir. adv. Math. VII. 154.
[172] Sext. Empir. adv. Math. VII. 154-156.
[173] Diog. Laërt. IV. 62, 65; Tennemann, Vol. IV. pp. 334, 443, 444; Cicer. Acad. Quæst. II. 6; Valer. Maxim. VIII. 7, ext. 5.
[174] Plutarch. Cato major, c. 22; Gell. Noct. Attic. VII. 14; Cic. De orat. II. 37, 38; Aelian. Var. hist. III. 17; Bruck. Hist. crit. phil. T. I. p. 763.
[175] Sext. Empir. adv. Math. VII. 159, 160.
[176] Sext. Empir. adv. Math. VII. 160, 161.
[177] Sext. Empir. adv. Math. VII. 161-164, 402.