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.