As a last hope then almost, Erasistratos was summoned from distant Alexandria as a consultant in the case of young Seleucus. The proceeding, after all, is very similar to what happens in our own time. The head of an important department in medicine at a university is asked to go a long distance to see the son of a reigning monarch, or of a millionaire prince in industry, or perhaps a coal baron, or a railroad king, and a special train is supplied for him and every convenience consulted. A caravan was sent to bring Erasistratos over the desert to Antioch. It is such consultations that count in a physician's life. I hope sincerely that you shall have many of them and that you shall conduct them as successfully as Erasistratos this one. The young prince's case proved as puzzling to Erasistratos for a time as it had to so many other physicians before him. Like the experienced practitioner he was, he did not make his diagnosis at once, however. Will you remember that when you, too, have a puzzling case? It is when we do not take time to make our diagnosis that it often proves erroneous. Not ignorance, but failure to investigate properly, is responsible for most of our errors. He asked to see the patient a number of times, and saw him under varying conditions. Finally, one day, while he was {388} examining the young man's pulse--and I may tell you that Erasistratos made a special study of the pulse and knew many things about it that it is unfortunate that the moderns neglect--his patient's pulse gave a sudden leap and then continued to go much faster than it had gone before. At the same time there came a rising color to the young man's cheek. Erasistratos looked up to see what was the cause of this striking change, and found that the young wife of the King Seleucus, the prince's stepmother, had just come into the room. Seleucus, as an old man, had married a very handsome young woman, and it was evident that the young man's heart was touched in her regard, and that here was the cause of the trouble. Erasistratos did not proclaim his discovery at once. He did announce that now he knew the cause of the trouble, that it was an affection of the heart that would be cured by travel, and he proposed to take young Seleucus back with him to Alexandria. In private, very probably, he told his young patient that he had discovered his secret, and then persuaded him that absence would be the thing for him. Very probably the young man considered that cure was impossible, and with many misgivings he consented to go to Alexandria, and as has happened many times before and since, in spite of the patient's assurance to the contrary, the travel cure proved effective even for the heart affection. {389}