The consideration of psychiatric factors in social life grew out of the consideration of social factors in psychiatric conditions. The social scientist was forced to indulge in psychiatric speculations and the psychiatrist became an amateur sociologist. This double transgression was sterile and confusing until Totem and Taboo1 began the revolution in methodology. This is not only a contribution of clinical psychiatry to social sciences, but an extension of it into them. Thus clinical psychiatry became the source of a new scientific discipline in social sciences and their new cornerstone.