R.

a necessity, 7. 520 E, 540 A; will be selected at twenty, and again at thirty, from the guardians, ib. 537; must learn arithmetic, ib. 522–526; geometry, ib. 526, 527; astronomy, ib. 527–530; harmony, ib. 531; at thirty must be initiated into philosophy, ib. 537–539; at thirty-five must enter on active life, ib. 539 E; after fifty may return to philosophy, ib. 540; when they die, will be buried by the state and paid divine honours, 3. 414 A; 5. 465 E, 469 A; 7. 540 B. Cp. Guardians.