. Contrary to the linguistic data published earlier by Statistics Canada, data checked in advance so as to eliminate all cases of double, multiple and missing responses, the mother tongue and languages actually reported in the 1981 census show a net anglicisation of the French group in Quebec. The francisation of non-native speakers does not compensate for the anglicisation movement of French speakers, especially among those under the age of 25. In contrast to the data checked, the actual answers to the language questions also make it possible to observe a phenomenon of bilingualism in the household that is very consistent with the linguistic assimilation movements highlighted by the declared tranferts.