The opportunity for Durkheim to receive a major academic appointment in Paris was inhibited by his approach to society. From 1882 to 1887 he taught philosophy at several provincial schools. In 1885 he decided to leave for Germany, where for two years he studied sociology at the universities of Marburg, Berlin and Leipzig. As Durkheim indicated in several essays, it was in Leipzig that he learned to appreciate the value of empiricism and its language of concrete, complex things, in sharp contrast to the more abstract, clear and simple ideas of the Cartesian method. By 1886, as part of his doctoral dissertation, he had completed the draft of his "The Division of Labour in Society", and was working towards establishing the new science of sociology.