chunk: Pascal has developed a serum he hopes will cure hereditary and nervous diseases (including consumption) and improve if not prolong life. His niece Clotilde sees Pascal's work as denying the omnipotence of God and as a prideful attempt to comprehend the unknowable. She encourages him to destroy his work, but he refuses. (Like other members of the family, Pascal is somewhat obsessive in the pursuit of his passion.) Pascal's explains his goal as a scientist as laying the groundwork for happiness and peace by seeking and uncovering the truth, which he believes lies in the science of heredity. After he shows her the Rougon-Macquart family tree and demonstrates his refusal to sugarcoat the family's acts, Clotilde begins to agree with him. Her love for him solidifies her faith in his theories and his lifelong work.