Anaximander, also a Milesian and a younger contemporary of Thales, who like him flourished between 500 and 600 B. C., said that the material cause of all things was the Infinite. “It is neither water nor any other of what are now called the elements, but a substance different from them which is infinite, from which arise all the heavens and the worlds within them.” “Man,” he boldly asserts, “is like another animal, namely, a fish, in the beginning,” a shrewd guess which is now an established fact.
Anaximenes, the third and last of the Milesian philosophers, while following his predecessors closely in time, disagreed with them as to the raw material of the universe. He declares it to be air which, “when it is dilated so as to be rarer becomes fire while winds, on the other hand, are condensed air, Cloud is formed from air by ‘felting’ and this, still further condensed, becomes water. Water, condensed still more, turns to earth; and when condensed as much as it can be, to stones.” All of which proves that Anaximenes had a very fertile brain.
Herakleitos, one of the greatest of all Greek thinkers, lived for a time at Ephesus and expressed the following forceful opinion of his fellow citizens: “The Ephesians would do well to hang themselves, every grown man of them, and leave the city to beardless youths; for they have cast out Hermodoros, the best man among them, saying: ‘We will have none who is best among us; if there be any such, let him be so elsewhere and among others.’” According to him everything comes from and returns to fire and “all things are in a state of flux like a river.” Here is the intellectual ancestor of Hegel with his great saying. “Nothing is, everything is becoming.” Herakleitos sagaciously observed: “You cannot step twice into the same rivers, for fresh waters are ever flowing in upon you.”
Parmenides, born at Elea about 515 B. C., was poet and philosopher both, and insisted in his hexameter verse that the universe is a unity, which neither came out of nothing, nor could, in any degree, pass away, thus anticipating by over 2,000 years Lavoisier’s doctrine of the permanence of matter.
Empedocles, of Akragas in Sicily, about the same time, stated this great truth with still greater force and clearness: “Fools!—for they have no far-reaching thoughts—who deem that what before was not, comes into being or that aught can perish and be utterly destroyed. For it cannot be that aught can arise from what in no way is, and it is impossible and unheard of that what is should perish; for it will always be, wherever one may keep putting it.” He also endeavored to combine and reconcile the ideas of some of his predecessors, teaching that all things come from four roots—water, air, fire and earth.
Anaxagoras, born about 500 B. C., was the first Greek to suffer for science. He was brought to trial for asserting the sun to be a red hot stone, and it would have probably gone hard with him had not the mighty Pericles been his friend. If the sun was merely a fiery ball, what became of the religion founded on the worship of Apollo?
Nearly a half a century earlier Xenophanes, of Colophon, had ventilated ideas much more obnoxious to the priests. He had done for his age what Feuerbach did to the Nineteenth century—he had explained the origin of the gods by Anthropomorphism. Said he: “If oxen or lions had hands, and could paint with their hands and produce works of art as men do, horses would paint the forms of the gods like horses and oxen like oxen. Each would represent them with bodies according to the form of each. So the Ethiopians make their gods black and snubnosed; the Thracians give theirs red hair and blue eyes.” Had Xenophanes lived at Athens, where a religious revival had just taken place, he would have shared the fate which later overtook the impious Socrates. Luckily for Xenophanes, in the colony where he lived “the gods were left to take care of themselves.” Anaxagoras was the first to determine what causes the eclipses and the illumination of the moon:—“The moon has not a light of her own but gets it from the sun. The moon is eclipsed by the earth screening the sun’s light from it. The sun is eclipsed at the new moon, when the moon screens it from us.”
The Pythagoreans who must be distinguished from the medicine man Pythagoras, from whom they only take their name indirectly, and not as disciples, believed the reality of the universe was to be found in numbers. They were deceived into this absurdity by the exactness of mathematical conclusions. This was excusable among the Greeks to whom arithmetical combinations were as wonderful as electrical phenomena are to us, but its revival in our day by astrologers and theosophists has no such justification.
Socrates, born about 470 B. C., at Athens, is described as “pug-nosed, thick-lipped, big-bellied and bulging-eyed”—the very opposite of the Greek ideal of beauty. He believed that knowledge itself would bring virtue, and sought to discover the true ground of knowledge. His search brought him into conflict with the religious bigotry of his day and he was finally sentenced to death and died from drinking hemlock in 399 B. C. He wrote nothing and his work is preserved mainly through his influence on Plato.
Leukippos and Demokritos are linked together through their statements of the atomic theory, made more than twenty centuries before Dalton. They placed the permanent reality of things in numberless atoms, of which Leukippos said “there are an infinite number of them, and they are invisible owing to the smallness of their bulk.”