In the evening when Thomas and Francois came home and learnt the news, they did not seem particularly surprised by it. They had doubtless felt that things would end like this. And they bowed to the _denouement_, not venturing to say a word, since it was their father himself who announced the decision which had been taken, with his usual air of composure. As for Antoine, who on his own side quivered with love for Lise, he gazed with doubting, anxious eyes at his father, who had thus had the courage to pluck out his heart. Could he really survive such a sacrifice, must it not kill him? Then Antoine kissed his father passionately, and the elder brothers in their turn embraced him with all their hearts. Guillaume smiled and his eyes became moist. After his victory over his horrible torments nothing could have been sweeter to him than the embraces of his three big sons. There was, however, further emotion in store for him that evening. Just as the daylight was departing, and he was sitting at his large table near the window, again checking and classifying the documents and plans connected with his invention, he was surprised to see his old master and friend Bertheroy enter the workroom. The illustrious chemist called on him in this fashion at long intervals, and Guillaume felt the honour thus conferred on him by this old man to whom eminence and fame had brought so many titles, offices and decorations. Moreover, Bertheroy, with his position as an official _savant_ and member of the Institute, showed some courage in thus venturing to call on one whom so-called respectable folks regarded with contumely. And on this occasion, Guillaume at once understood that it was some feeling of curiosity that had brought him. And so he was greatly embarrassed, for he hardly dared to remove the papers and plans which were lying on the table. "Oh, don't be frightened," gaily exclaimed Bertheroy, who, despite his careless and abrupt ways, was really very shrewd. "I haven't come to pry into your secrets. . . . Leave your papers there, I promise you that I won't read anything." Then, in all frankness, he turned the conversation on the subject of explosives, which he was still studying, he said, with passionate interest. He had made some new discoveries which he did not conceal. Incidentally, too, he spoke of the opinion he had given in Salvat's affair. His dream was to discover some explosive of great power, which one might attempt to domesticate and reduce to complete obedience. And with a smile he pointedly concluded: "I don't know where that madman found the formula of his powder. But if you should ever discover it, remember that the future perhaps lies in the employment of explosives as motive power." Then, all at once, he added: "By the way, that fellow Salvat will be executed on the day after to-morrow. A friend of mine at the Ministry of Justice has just told me so."