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ter than madmen ( Xen . Mem , i. 1, 11-
15).
Plato (born 429 B.C.), the pupil of Socrates,
the fellow-student of Euclid, and a follower
of Pythagoras, studied science in his trav-
els in Egypt and elsewhere. He was held in
so great reverence by all learned men that
a problem which he set to the astronomers
was the keynote to all astronomical investi-
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