Aet. _Plac._ v. 7; 420. Anaxagoras, Parmenides: Males are conceived when seed from the right side enters the right side of the womb, or seed from the left side the left side of the womb; but if its course is changed females are born. v. 19; 430. As Anaxagoras and Euripides say: Nothing of what is born dies, but one thing separated from one part and added to another produces different forms. v. 20; 432. Anaxagoras: All animals have reason that shows itself in activity, but they do not have a sort of intelligence that receives impressions, which may be called the interpreter of intelligence. v. 25; 437. Anaxagoras: Sleep is due to a weariness of the body’s energy; for it is an experience of the body, not of the soul; and death is the separation of the soul from the body. Theophr. _Phys. opin._ Fr. 4; _Dox._ 479. Theophrastos says that the teaching of Anaxagoras is much like that of Anaximandros; for Anaxagoras says that in the separation of the infinite, things that are akin come together, and whatever gold there is in the all becomes gold, and whatever earth becomes earth, and in like manner each of the other things, not as though they came into being, but as though they were existing before. And Anaxagoras postulated intelligence (νοῦν) as the cause of motion and of coming into being, and when this caused separation worlds were produced and other objects sprang forth. He might seem, he says, to make the material causes of things taking place thus infinite, but the cause of motion and of coming into being one. But if one were to assume that the mixture of all things were one nature undefined in form and in amount, which he seems to mean, it follows that he speaks of two first principles, the nature of the infinite and intelligence, so that he appears to treat all the material elements in much the same manner as Anaximandros. _Phys. op._ Fr. 19; _Dox._ 493. See Aet. ii. 29; _Dox._ 360, translated above, p. 255. _Phys. opin._ Fr. 23; _Dox._ 495. And the third opinion about the sea is that the water which filters and strains through the earth becomes salt because the earth has such flavours in it; and they point out as a proof of this that salt and saltpetre are dug up out of the earth, and there are bitter flavours at many places in the earth. Anaxagoras and Metrodoros came to be of this opinion.