ἀλλ᾽ αὐτὰ ταῦτα. See on Apol. 23B. ταῦτα = διὰ ταῦτα is frequent in Plato and Aristophanes.
34. ὅτε τὸ πρότερον ἐπεδήμησεν. Probably about 445 B.C., if the date of action of the dialogue is 433-432. (See Introduction p. xxxiii.) Protagoras went to Thurii in 443 B.C., being charged by Pericles to draw up a code of laws for the new colony.