"I tell you I haven't seen him for several days," said she. "He must certainly be in Belgium. And as for a bomb, that's humbug. You say yourself that he's very gentle and wouldn't harm a fly!" A little later as Pierre journeyed back to Neuilly in a tramcar he fell into a deep reverie. All the stir and bustle of that working-class district, the buzzing of the factory, the overflowing activity of that hive of labour, seemed to have lingered within him. And for the first time, amidst his worries, he realised the necessity of work. Yes, it was fatal, but it also gave health and strength. In effort which sustains and saves, he at last found a solid basis on which all might be reared. Was this, then, the first gleam of a new faith? But ah! what mockery! Work an uncertainty, work hopeless, work always ending in injustice! And then want ever on the watch for the toiler, strangling him as soon as slack times came round, and casting him into the streets like a dead dog immediately old age set in. On reaching Neuilly, Pierre found Bertheroy at Guillaume's bedside. The old _savant_ had just dressed the injured wrist, and was not yet certain that no complications would arise. "The fact is," he said to Guillaume, "you don't keep quiet. I always find you in a state of feverish emotion which is the worst possible thing for you. You must calm yourself, my dear fellow, and not allow anything to worry you." A few minutes later, though, just as he was going away, he said with his pleasant smile: "Do you know that a newspaper writer came to interview me about that explosion? Those reporters imagine that scientific men know everything! I told the one who called on me that it would be very kind of _him_ to enlighten _me_ as to what powder was employed. And, by the way, I am giving a lesson on explosives at my laboratory to-morrow. There will be just a few persons present. You might come as well, Pierre, so as to give an account of it to Guillaume; it would interest him." At a glance from his brother, Pierre accepted the invitation. Then, Bertheroy having gone, he recounted all he had learnt during the afternoon, how Salvat was suspected, and how the investigating magistrate had been put on the right scent. And at this news, intense fever again came over Guillaume, who, with his head buried in the pillow, and his eyes closed, stammered as if in a kind of nightmare: "Ah! then, this is the end! Salvat arrested, Salvat interrogated! Ah! that so much toil and so much hope should crumble!" IV CULTURE AND HOPE