Summary :
This account of Halbwachs trip to Chicago in 1930 shows the ambiguity of his conception of the social sciences ( he remained faithful to strict positivist methods in his way of presenting evidence, but his interest for certain types of study matter enabled him to come closer to a phenomenological conception of social realities), which may be illustrated by the way he reacted to the work done by his American colleagues.
Key words : Sociology, Collective Psychology, Chicago School, Methodology, Halbwachs
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