One fact aroused his suspicion: he fancied that he observed a certain constraint in Professor Louvet's manner toward himself. As the head of the clinical staff he was in constant communication with the illustrious master of the Hôtel-Dieu. It had seemed to him, during the last weeks, that his chief's handshake was, not less cordial, but less unreserved, less familiar--in a word, that there was "a thorn" in it, as they would have said to each other in neurologists' parlance, in speaking of a common abrasion of the skin on a patient. Under any other circumstances Pierre would not have hesitated to question the professor. He did not do it. He had put together the two symptoms: the change in his master's manner to him, and the change in his father. He had drawn therefrom the conclusion, still automatically,--a profession like his ends by imparting a mechanical method, an instinctive gait, to the mind,--that the same fact was at the root of both. What fact? The quarrel between Chaffin and M. de Claviers, that old and very important patient of Louvet. Pierre knew the marquis well, and although he had for him the antipathy of one social class for another, his innate sense of justice compelled him to esteem the great nobleman's greatness of soul. No, the châtelain of Grandchamp, who bestowed pensions on scores of old servants,--only two months since, his factotum was bewailing the fact at the family table!--had not parted, without weighty reasons, from one whom he had had in his service so many years. What were those reasons? This question had been haunting the physician for several days, with such persistent and increasing distress, that it had occurred to him to seek an answer to it from Landri. He had been deterred by very diverse considerations. It will be recalled that their relations had never been perfectly simple. It was hard for the plebeian to ask the titled man if his, the plebeian's, father had been guilty of any offence contrary to honor. It was painful, too, for the physician, who had learned, in the delirium of a death-agony, the secret of an illegitimate birth, to seek a meeting with the son of the patient,--a meeting over which that consciousness would hover like a pall, especially as Pierre knew the terms of Jaubourg's will, and he did the child of that adulterous connection the justice to believe that M. de Claviers' acceptance of the legacy was torture to him.