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?