"You are doubtless," said he, "his Highness's cousin, the Cavaliere Valsecca; and my excuse for intruding between yourself and the prince is that I am the Duke's physician, Count Heiligenstern, and that the heir is at present undergoing a course of treatment under my care. His health, as you probably know, has long been a cause of anxiety to his illustrious parents, and when I was summoned to Pianura the College of Physicians had given up all hope of saving him. Since my coming, however, I flatter myself that a marked change is perceptible. My method is that of invigorating the blood by exciting the passions most likely to produce a generous vital ardour. Thus, by organising these juvenile manoeuvres, I arouse the prince's martial zeal; by encouraging him to study the history of his ancestors, I evoke his political ambition; by causing him to be led about the gardens on a pony, accompanied by a miniature pack of Maltese dogs in pursuit of a tame doe, I stimulate the passion of the chase; but it is essential to my system that one emotion should not violently counteract another, and I am therefore obliged to protect my noble patient from the sudden intrusion of new impressions." This explanation, delivered in a sententious tone, and with a strong German accent, seemed to Odo no more than a learned travesty of the familiar and pathetic expedient of distracting a sick child by the pretence of manly diversions. He was struck, however, by the physician's aspect, and would have engaged him in talk had not one of the Duke's gentlemen appeared with the announcement that his Highness would be pleased to receive the Cavaliere Valsecca. Like most dwellings of its kind in Italy, the palace of Pianura resembled one of those shells which reveal by their outer convolutions the gradual development of the creature housed within. For two or three generations after Bracciaforte, the terrible founder of the line, had made himself master of the republic, his descendants had clung to the old brick fortress or rocca which the great condottiere had held successfully against the burghers' arquebuses and the battering-rams of rival adventurers, and which still glassed its battlements in the slow waters of the Piana beside the city wall. It was Ascanio, the first Duke, the correspondent of Politian and Castiglione, who, finding the ancestral lair too cramped for the court of a humanist prince, had summoned Luciano da Laurana to build a palace better fitted to his state. Duke Ascanio, in bronze by Verocchio, still looked up with pride from the palace-square at the brick and terra-cotta facade with its fruit-wreathed arches crowned by imperial profiles; but a later prince found the small rooms and intricate passages of Laurana's structure inadequate to the pomp of an ally of Leo X., and Vignola added the state apartments, the sculpture gallery and the libraries.