In the rules laid down by these professors, changes were effected by Chrysippus with a vast parade of words, and, after Chrysippus, by Erasistratus, son2460 of the daughter of Aristotle. For the cure of King Antiochus—to give our first illustration of the profits realized by the medical art—Erasistratus received from his son, King Ptolemæus, the sum of one hundred talents.