James Adam, The Republic of Plato

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ἀγωγάς . ἀγωγή is tempo (Gleditsch p. 688). The unit of measurement was the χρόνος πρῶτος or ¯: and hence the dactyl. for example, has usually a τετράσημος ἀγωγή, the iambus a τρίσημος, and so on. See Excerpta Neapol. in von Jan's Mus. Script. Gr. § 14. The duration of the χρόνος πρῶτος was of course relative, and not absolute, so that the time occupied in singing or declaiming a foot often varied, and we are told that ἔστιν ὅτε καὶ ἐν δισήμῳ (sc. ἀγωγῇ) γίνεται δακτυλικὸς πούς (Exc. Neap. l. c.). But it is clear that in general the ἀγωγαί of the different kinds of feet were different from one another. Hartman ejects τοῦ ποδός, “cum apud Platonem πούς et ῥυθμός non discrepent.” The distinction between πούς and ῥυθμός is not always preserved by writers on metre (e.g. Bacchius Isag. 100 ff. ed. von Jan), but Plato seems to make the πούς differ from the ῥυθμός as the unit from the whole.

ἤτοι. See on I 344 E.

εὐσχημοσύνης: grace or beauty of form in the widest sense. The word is introduced in view of the application of these principles to objects appealing to the eye: see 401 A.