got the mastery causes night ; the increase of warmth due to the bright exhalation produces summer, whereas the preponderance of moisture due to the dark exhalation brings about winter. His explanations of other phenomena are in harmony with this. He gives no account of the nature of the earth, nor even of the bowls. These, then, were his opinions. The story told by Ariston of'ISocrates, and his remarks when he came upon the book of Heraclitus, which Euripides brought him, I have mentioned in my Life of Socrates. a However, Seleucus the grammarian says that a certain Croton relates in his book called The Diver that the said work of Heraclitus was first brought into Greece by one Crates, who further said it required a Delian diver not to be drowned in it. The title given to it by some is The Muses, b by others Concerning Nature ; but Diodotus calls it c A helm unerring for the rule of life others " a guide of conduct, the keel of the whole world, for one and all alike." We are told that, when asked why he kept silence, he replied, " Why, to let you chatter." Darius, too, was eager to make his acquaintance, and wrote to him as follows d : " King Darius, son of Hystaspes, to Heraclitus the wise man of Ephesus, greeting. " You are the author of a treatise On Nature which and possibly, as M. Ernout thinks, by Lucretius, i. 657, where " Musae " is the ms. reading. But cf. Lachmann, ad loc. c Nauck, T.G.F. 2 , Adesp. 287. d The request of Darius is mentioned by Clem. Alex. Strom, i. 65 ovtos (3acn\ea. Aapeiov wapaKaXovvra irjKeLV eis Uepcras vTrepe?8eu. The story is not made more plausible by the two forged letters to which it must have given rise.