πείθηται κτἑ.: see on 311 d, 1. 20.
καὶ πληγαῖς: cf. Menand. Sent. 422 ὁ μὴ δαρεὶς ἄνθρωπος οὐ παιδεύεται.
εἰς διδασκάλων: see on 326 c, 1. 37.
With the γραμματιστής the boys learned τὰ γράμματα, i.e. to read and write, then with the κιθαριστής they learned to sing, and generally to play the lyre.