Philox Lorris seeing the failure of his plans, engages George in military maneuvers where George excels and advances in esteem of his bride even further. When George returns from his trip, more than ever convinced in the rightness of his decision to marry Estelle, his father becomes furious. Still, Philox Lorris believes he can alter the choice of his son. Philox Lorris is working on his two novel scientific applications: a biological weapon and a vaccine that is meant to give boost to one's health. To promote these achievements and lobby them on a political level, he organizes a large party at his house to which he invites various dignitaries, including Arsène de Marettes, a prominent political figure. George is asked to collect the video-recordings of the greatest singers and performers of the past and play them for the audience. Unfortunately, as the party begins and the videos are played out, the sound quality turns out to be mediocre. The voices recorded on the tapes sound as if their owners caught a cold. This is due to Sulfatin's absent-mindedness: he took the tapes out to a chilly air last night. Due to this unforeseen circumstance, the video concert is going to be stopped in the middle. However, Estelle had taken the copies of the tapes for her personal enjoyment, and since the copies have not been affected by the cold air, she is able to replace the originals with them after which the concert continues with great success. Meanwhile, Philox Lorris explains his inventions to politicians. Sulfatin who is assisting him with the demonstrations, confuses the health vaccine with the biological weapon and lets some of the latter escape into the room where the guests are gathered. Panic ensues; and many people including Philox Lorris and Sulfatin are poisoned. Luckily, the weapon is not lethal, and only incapacitates the affected. The house of Philox Lorris is transformed into a hospital where the guests (named the martyrs of the science in newspapers) occupy sick-beds. Philox Lorris and Sulfatin quarrel, but soon notice that Adrien La Héronnière recently cured by Sulfatin by the vaccine is immune to the poison. Philox Lorris has an idea: he tries the vaccine on himself and in two days recovers completely. He repeats the application of the vaccine on the rest of the sick and achieves the desired effect. This makes a phenomenal advertisement of the vaccine which is immediately accepted as panacea on a national level.