some one expressed surprise at his taking it so quietly, Socrates rejoined, ‘‘ Should I have taken the law of a donkey, supposing that he had kicked me?” Thus far Demetrius. Unlike most philosophers, he had no need to travel, except when required to go on an expedition. The rest of his life he stayed at home and engaged all the more keenly in argument with anyone who would converse with him, his aim being not to alter his opinion but to get at the truth. They relate that Euripides gave him the treatise of Heraclitus and asked his opinion upon it, and that his reply was, ‘ The part I understand is excellent, and so too is, I dare say, the part I do not understand ; but it needs a Delian diver to get to the bottom of it.” He took care to exercise his body and kept in good condition. At all events he served on the expedition to Amphipolis; and when in the battle of Delium Xenophon had fallen from his horse, he stepped in and saved his life. For in the general flight of the Athenians he personally retired at his ease, quietly turning round from time to time and ready to defend himself in case he were attacked. Again, he served at Potidaea, whither he had gone by sea, as land communications were interrupted by the war*; and while there he is said to have remained a whole night without changing his position, and to have won the prize of valour. But he resigned it to Alcibiades, for whom he cherished the tenderest affection, according to Aristippus in the fourth book of his treatise On the Luxury of the Ancients. Ion of