Cf. A. Dobbs, _Philosophy and Popular Morals in Ancient Greece_ (1907), p. 48. For examples, cf. Hippias, cited below, n. 6, or Lycophron, opposed by Aristotle, cited below in Aristotle’s criticism of socialism (_Pol._ 1280_b_10-12). Footnote 41: _Rep._ i, and the story of Gyges, _Rep._ ii. Footnote 42: _Gorg._ 482E ff., though Callicles was hardly a Sophist. Footnote 43: E.g., Hippias in _Protag._ 337C, where he says that men are related (συγγενεῖς, οἰκείους) by nature, not by law, and that the law is a tyrant of men that does much violence contrary to nature (παρὰ τὴν φύσιν). Footnote 44: Cf. Alcidamas frag., cited _infra_ on Aristotle’s theory of slavery, and Ar. _Pol._ i. 3. 1253_b_20-23; Lycophron (pseudo-Plut. _Pro. Nob._ 18. 2) denies the reality of the distinction between noble and ill-born. Cf. also on Euripides, _infra_. On the development of the opposition to slavery in Greece, cf. Newman, _Pol. of Arist._, I, 139 ff. Footnote 45: Diog. L. ix. 55: δίκη ὑπὲρ μισθοῦ. Cf. Diels, _op. cit._, II, 220, 231; Croiset, _Hist. de la Litt. Gr._, IV, 54. Souchon (_op. cit._, p. 23, n. 1) thinks that it may have taught the dignity of all labor. Cf. also Plato (_Sophist_ 232 D): τὰ πρωταγόρεια ... περί τε πάλης καὶ τῶν ἄλλων τεχνῶν. Gomperz (_Die Apologie der Heilkunst_, p. 33) infers that Protagoras had published a _Gesammtapologie der Künste_. Cf. _Pol._ 299C, and Diog. L. ix. 8. 55. Footnote 46: Cf. Plato _Protag._ 328B, where Protagoras states his rule as to charges for his lectures. Cf. Zeller, _op. cit._, I, 2, 1080 ff., on the earnings of the Sophists. Cf. Plato _Euthyd._ 304C: ὅτι οὐδὲ τοῦ χρηματίζεσθαί φατον διακωλύειν οὐδέν. Footnote 47: Plato _Charm._ 163 B-D on Hesiod. Footnote 48: Xen. _Mem._ ii. 1. 21-34, the story of Heracles (28). Footnote 49: Pseudo-Platon. _Eryxias_ 397 D-E, discussed _infra_. Footnote 50: _Hippias Minor_ 368 D, where he is presented as the jack of all trades. Cf. _infra_ for the antithetic attitude of Plato. Footnote 51: _Orestes_ 917-22; _Supplices_ 399-456, 238-45; _Phoenissae_ 535-51 (Dindorf), cited by Dümmler, _Proleg. zu Platons Staat_ (1891), to show that there are traces of a political treatise of the school of Antiphon in Euripides. Cf. Barker, _op. cit._, p. 25 and note. Footnote 52: _Orestes_ 917 ff.; cf. also the noble character of the peasant (αὐτουργός) in the _Electra_, who is a noble soul (252 f.), and who speaks the prologue, though he is only a secondary person in the play. Cf. also 367-82. Footnote 53: Fr. 345 (Nauck), the unjust man is ignoble (δυσγενής), though better born than Zeus; frs. 54 (Alex.), 514 (Melanippe), 8 (Electra); cf. n. 1 above, and _infra_. He puts worthy sentiments into the mouths of slaves and dresses his nobles in rags. Footnote 54: