Dialogue

 1 Intro|      of Protagoras is just and sound; remarks are made by him
 2 Intro|      we see and hear,—e.g. the sound of words or the sight of
 3 Intro|     doubtless give them both a sound castigation and be off to
 4 Intro|      mind have a materialistic sound; for old mythology was allied
 5 Intro|      place, the same colour or sound or smell or taste, will
 6  Thea|  variety of sight, and so with sound and hearing, and with the
 7  Thea| elevation or depression of the sound of them; but we do not perceive
 8  Thea|     flux a ring: is the theory sound or not? at any rate, no
 9  Thea|      in a word, if our view is sound, there can be no error or
10  Thea|       the seven vowels, have a sound only, but no definition