The sun and the moon are separated from the milky way, the one from the thinner mixture, which is hot, the other from the denser, which is cold. 25; 356. The moon is of a fiery nature. 26; 357. The moon is of the same size as the sun, and derives its light from it. 30; 361. (The moon appears dark) because darkness is mingled with its fiery nature, whence he calls it the star that shines with a false light. Aet. iii. 1; 365. The mixture of dense and thin gives its milk-like appearance to the milky way. 11; 377. Parmenides first defined the inhabited parts of the earth by the two tropical zones. 15; 380. Because the earth is equally distant on all sides from other bodies, and so rests in an equilibrium, not having any reason for swaying one way rather than another; on this account it only shakes and does not move from its place. Aet. iv. 3; 388. The soul is of a fiery nature. 5; 391. The reason is in the whole breast. 392. Life and intelligence are the same thing, nor could there be any living being entirely without reason. 9; 397. Sensations arise part by part according to the symmetry of the pores, each particular object of sense being adapted to each sense (organ). 398. Desire is produced by lack of nourishment. Aet. v. 7; 419. Parmenides holds the opposite opinion; males are produced in the northern part, for this shares the greater density; and females in the southern part by reason of its rarefied state. 420. Some descend from the right side to the right parts of the womb, others from the left to the left parts of the womb; but if they cross in the descent females are born. 11; 422. When the child comes from the right side of the womb, it resembles the father; when it comes from the left side, the mother. 30; 443. Old age attends the failure of heat. VII. _THE ELEATIC SCHOOL: ZENO._ Zeno of Elea, son of Teleutagoras, was born early in the fifth century B.C. He was the pupil of Parmenides, and his relations with him were so intimate that Plato calls him Parmenides’s son (_Soph._ 241 D). Strabo (vi. 1, 1) applies to him as well as to his master the name Pythagorean, and gives him the credit of advancing the cause of law and order in Elea. Several writers say that he taught in Athens for a while. There are numerous accounts of his capture as party to a conspiracy; these accounts differ widely from each other, and the only point of agreement between them has reference to his determination in shielding his fellow conspirators. We find reference to one book which he wrote in prose (Plato, _Parm._ 127 C), each section of which showed the absurdity of some element in the popular belief.