Toward the end of Louis Hémon's novel Maria Chapdelaine, which is perhaps the work most representative of traditional French Canadianism, one finds this lyrical passage: “… in the country of Quebec, nothing has changed. Nothing will change, because we are a testimony.” This was written in 1916, but evidently many things have changed since that time. Economic evolution, urbanization, spread of knowledge, technical progress have greatly modified individual and family life as well as social environment. And these transformations have affected the very core of both French-Canadian society and French-Canadian individuals. As a matter of fact, they have burst the old framework of self-sufficient social life and they have transformed the most fundamental motivations of the individual and of conjugal behaviour. Even in the observance of formal moral rules their impact has been felt. It is not surprising that such changes have affected the demographic pattern to a large extent. Most French-Canadian scholars, social philosophers, and political leaders, who are specially interested in the French-Canadian ethnic group, are relatively unaware of the extent of this demographic change and some would not readily admit it. In this paper, I would like to try to throw some light on the main demographic facts and problems of this evolution or, as one might be tempted to name it, revolution.