[49] Ecl. Phys. 797, Cicero, de Nat. Deor. iii. 14.
[50] See ii. 4, 1. 'pôs echon.' of Dikearchus and Aristoxenus.
[51] See ii. 6, on 'logos.'
[52] See v. 7, 3.
[53] iii. 2.
[54] See iv. 2, 2.
[55] iv. 2, 1.
[56] Plutarch, de Placitis Philosoph, iii. 8. The Stoic definition of sensation being that senses are spirits stretched (by relays with "tension") from the directing principle to the organs.
[57] de Nat. Hom. 2.
[58] See iv. 4, 23. In the words of Zeno, as, for the Stoics, the principal act of the intelligence was comprehensive vision, "phantasia kataleptike."