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56 from this change, there are in practice always two things to be said, a pro and a con. [sic] about every possible proposition. There is no general statement that cannot be contradicted.

Other teachers also are represented as having influenced Euripides; Archelaus, who tried to conceive Anaxagoras's "Mind" in some material form, as air or spirit—for spiritus, of course, means "breath"; Prodicus, who, besides his discoveries in grammar, is the author of a popular and edifying fable which has served in many schoolrooms for many centuries. It tells how Heracles once came to some cross roads, one road open, broad, and smooth and leading a little downhill, the other narrow and uphill and rough: and on the first you gradually became a worse and worse man, on the second a better one. There was Diogenes of Apollonia, whose theories about air seem to have had some effect on Euripides' writings; and of course there was, among the younger men, Socrates. Socrates is too great and too enigmatic a teacher to be summed up in a few sentences, and though a verse of ancient comedy has come down to us, saying, "Socrates piles the faggots for Euripides' fire," his influence on his older friend is not very conspicuous. Euripides must have