[258] See iii. 6.5.

[259] See v. 3.3.

[260] From the circumference, see iii. 8.7.

[261] Cicero, Tusculans, i. 22.

[262] See i. 4.9.

[263] See iii. 9.9.

[264] See iii. 8.9.

[265] iii. 9.4.

[266] iii. 8.9.

[267] See v. 1.7.