This article studies Durkheim's views on altruism and selfishness and, therefore, on modern individualism. In contrast to Comte and Spencer, Durkheim used these concepts in his empirical work on suicide and then as intellectual tools for explaining his view on the professional and political organization required in a modern democracy. Finaly, the article examines how Durkheim's views were modified by the Durkheimian, notably with Marcel Mauss’ emphasis on interested/desinterested behaviors in gift-giving processes which are the empirical and symbolical roots of social solidarity.