depart from our original models (ii. 379 foll.; cp. Laws, vii. 817). Next as to the music. A song or ode has three parts,--the subject, the harmony, and the rhythm; of which the two last are dependent upon the first. As we banished strains of lamentation, so we may now banish the mixed Lydian harmonies, which are the harmonies of lamentation; and as our citizens are to be temperate, we may also banish convivial harmonies, such as the Ionian and pure Lydian. *399* Two remain--the Dorian and Phrygian, the first for war, the second for peace; the one expressive of courage, the other of obedience or instruction or religious feeling. And as we reject varieties of harmony, we shall also reject the many-stringed, variously-shaped instruments which give utterance to them, and in particular the flute, which is more complex than any of them. The lyre and the harp may be permitted in the town, and the Pan's-pipe in the fields. Thus we have made a purgation of music, and will now make a purgation of metres. *400* These should be like the harmonies, simple and suitable to the occasion. There are four notes of the tetrachord, and there are three ratios of metre, 3/2, 2/2, 2/1, which have all their characteristics, and the feet have different characteristics as well as the rhythms. But about this you and I must ask Damon, the great musician, who speaks, if I remember rightly, of a martial measure as well as of dactylic, trochaic, and iambic rhythms, which he arranges so as to equalize the syllables with one another, assigning to each the proper quantity. We only venture to affirm the general principle that the style is to conform to the subject and the metre to the style; and that the simplicity and harmony of the soul should be reflected in them all. This principle of simplicity has to be learnt by every one in the days of his youth, *401* and may be gathered anywhere, from the creative and constructive arts, as well as from the forms of plants and animals.