sentences:  He occupied the Chair of Evolutionary Biology of the Faculty of Paris, of which the two previous occupiers, Alfred Giard (1846–1908) and Maurice Caullery (1868–1958), were both also supporters of Lamarckism.Only after Grassé's retirement did the chair become occupied by a partisan of Darwinism, Charles Bocquet (1918–1977).In support of Lamarck's theories he organised an international congress in Paris in 1947 under the auspices of the CNRS with the theme "paleontology and transformism".