Alexander now fell ill from the toils he had undergone, according to the account of Aristobulus; but other authors say that while he was very hot and in profuse perspiration he leaped into the river Cydnus[219] and swam, being eager to bathe in its water. This river flows through the midst of the city; and as its source is in mount Taurus and it flows through a clean district, it is cold and its water is clear. Alexander therefore was seized with convulsions, accompanied with high fever and continuous sleeplessness. None of the physicians thought he was likely to survive,[220] except Philip, an Acarnanian, a physician in attendance on the king, and very much trusted by him in medical matters, who also enjoyed a great reputation in the army in general affairs. This man wished to administer a purgative draught to Alexander, and the king ordered him to administer it. While Philip was preparing the cup, a letter was given to the king from Parmenio, warning him to beware of Philip; for he heard that the physician had been bribed by Darius to poison Alexander with medicine. But he, having read the letter, and still holding it in his hand, took the cup which contained the medicine and gave Philip the letter to read. While Philip was reading the news from Parmenio, Alexander drank the potion. It was at once evident to the king that the physician was acting honourably in giving the medicine, for he was not alarmed at the letter, but only so much the more exhorted the king to obey all the other prescriptions which he might give, promising that his life would be saved if he obeyed his instructions. Alexander was purged by the draught, and his illness then took a favourable turn. He afterwards proved to Philip that he was a faithful friend to him; and to the rest of those about he proved that he had perfect confidence in his friends by refusing to entertain any suspicion of their fidelity; and at the same time he showed that he could meet death with dauntless courage.[221] CHAPTER V. ALEXANDER AT THE TOMB OF SARDANAPALUS.—PROCEEDINGS IN CILICIA.