Monday, June 2, was the day fixed for the post-mortem; it was performed in the hotel at Saint Cloud. Castaing was still in the hotel under provisional arrest. While the post-mortem was going on his agitation was extreme; he kept opening the door of the room in which he was confined, to hear if possible some news of the result. At last M. Pelletan obtained permission to inform him of the verdict of the doctors. It was favourable to Castaing; no trace of death by violence or poison had been discovered.
The medical men declared death to be due to an inflammation of the stomach, which could be attributed to natural causes; that the inflammation had subsided; that it had been succeeded by cerebral inflammation, which frequently follows inflammation of the stomach, and may have been aggravated in this case by exposure to the sun or by over-indulgence of any kind.
II THE TRIAL OF DR. CASTAING
Castaing expected, as a result of the doctors' report, immediate release. In this he was disappointed; he was placed under stricter arrest and taken to Paris, where a preliminary investigation commenced, lasting five months. During the early part of his imprisonment Castaing feigned insanity, going to disgusting lengths in the hope of convincing those about him of the reality of his madness. But after three days of futile effort he gave up the attempt, and turned his attention to more practical means of defence. In the prison at Versailles, whither he had been removed from Paris, he got on friendly terms with a prisoner, one Goupil, who was awaiting trial for some unimportant offence. To Goupil Castaing described the cruelty of his position and the causes that had led to his wrongful arrest. He admitted his unfortunate possession of the poison, and said that the 100,000 francs which he had invested he had inherited from an uncle. Through Goupil he succeeded in communicating with his mother in the hope that she would use her influence to stifle some of the more serious evidence against him. Through other prisoners he tried to get at the chemists from whom he had bought acetate of morphia, and persuade them to say that the preparation of morphia which he had purchased was harmless.
The trial of Castaing commenced before the Paris Assize Court on November 10, 1823. He was charged with the murder of Hippolyte Ballet, the destruction of a document containing the final dispositions of Hippolyte's property, and with the murder of Auguste Ballet. The three charges were to be tried simultaneously. The Act of Accusation in Castaing's case is a remarkable document, covering a hundred closely-printed pages. It is a well-reasoned, graphic and unfair statement of the case for the prosecution. It tells the whole story of the crime, and inserts everything that can possibly prejudice the prisoner in the eyes of the jury. As an example, it quotes against Castaing a letter of his mistress in which, in the course of some quarrel, she had written to him saying that his mother had said some "horrible things" (des horreurs) of him; but what those "horrible things" were was not revealed, nor were they ever alluded to again in the course of the trial, nor was his mistress called as a witness, though payments of money by Castaing to her formed an important part of the evidence against him. Again, the evidence of Goupil, his fellow prisoner, as to the incriminating statements made to him by Castaing is given in the Act of Accusation, but Goupil himself was not called at the trial.
During the reading of the Act of Accusation by the Clerk of the Court Castaing listened calmly. Only when some allusion was made to his mistress and their children did he betray any sign of emotion. As soon as the actual facts of the case were set out he was all attention, making notes busily. He is described as rather attractive in appearance, his face long, his features regular, his forehead high, his hair, fair in colour, brushed back from the brows; he wore rather large side-whiskers. One of the witnesses at Saint Cloud said that Castaing looked more like a priest than a doctor; his downcast eyes, gentle voice, quiet and unassuming demeanour, lent him an air of patience and humility.
The interrogatory of Castaing by the presiding judge lasted all the afternoon of the first day of the trial and the morning of the second. The opening part of it dealt with the murder of Hippolyte Ballet, and elicited little or nothing that was fresh. Beyond the purchase of acetate of morphia previous to Hippolyte's death, which Castaing reluctantly admitted, there was no serious evidence against him, and before the end of the trial the prosecution abandoned that part of the charge.
Questioned by the President as to the destruction of Hippolyte Ballet's will, Castaing admitted that he had seen a draft of a will executed by Hippolyte in favour of his sister, but he denied having told Auguste that Lebret had in his possession a copy which he was prepared to destroy for 100,000 francs. Asked to explain the assertion of Mlle. Percillie, Auguste's mistress, that statements to this effect had been made in her presence by both Auguste Ballet and himself, he said that it was not true; that he had never been to her house. "What motive," he was asked, "could Mlle. Percillie have for accusing you?" "She hated me," was the reply, "because I had tried to separate Auguste from her." Castaing denied that he had driven with Auguste to Lebret's office on October 8. Asked to explain his sudden possession of 100,000 francs at a moment when he was apparently without a penny, he repeated his statement that Auguste had given him the capital sum as an equivalent for an income of 4,000 francs which his brother had intended to leave him. "Why, when first asked if you had received anything from Auguste, did you say you had received nothing?" was the question.
"It was a thoughtless statement," was the answer. "Why," pursued the President, "should you not have admitted at once a fact that went to prove your own good faith? If, however, this fact be true, it does not explain the mysterious way in which Auguste asked Prignon to raise for him 100,000 francs; and unless those 100,000 francs were given to you, it is impossible to account for them. It is important to your case that you should give the jury a satisfactory explanation on this point." Castaing could only repeat his previous explanations.
The interrogatory was then directed to the death of Auguste Ballet. Castaing said that Auguste Ballet had left him all his fortune on account of a disagreement with his sister. Asked why, after Auguste's death, he had at first denied all knowledge of the will made in his favour and deposited by him with Malassis, he could give no satisfactory reason. Coming to the facts of the alleged poisoning of Auguste Ballet, the President asked Castaing why, shortly after the warm wine was brought up on the night of May 30, he went up to the room where one of the servants of the hotel was lying sick. Castaing replied that he was sent for by the wife of the hotel-keeper. This the woman denied; she said that she did not even know that he was a doctor. "According to the prosecution," said the judge, "you left the room in order to avoid drinking your share of the wine." Castaing said that he had drunk half a cupful of it. The judge reminded him that to one of the witnesses Castaing had said that he had drunk only a little.