Bergson settled again in Paris in 1888, and after teaching for some months at the municipal college, known as the "College Rollin", he received an appointment at the Lycée Henri-Quatre, where he remained for eight years. There, he read Darwin and gave a course on his theories. Although Bergson had previously endorsed Lamarckism and its theory of the heritability of acquired characteristics, he came to prefer Darwin's hypothesis of gradual variations, which were more compatible with his continual vision of life.