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During one of his last courses at the Collège de France, Pierre Janet (1928) developed a general theory of memory, L’évolution de la mémoire et de la notion du temps (from December 1, 1927, to March 8, 1928). This course on memory well illustrates the evolution of Janet’s conceptions and notably the increasing importance that he assigned to the society in the organization and the genesis of psychological functions. Ideas on the memory explained in this course, although underestimated today, complete nevertheless two very famous and contemporary theories of the memory: Halbwachs (1925) and Bartlett (1932). Indeed, for Janet, memory is above all a social function and not an individual one. Here we shall examine the main lines of this fascinating theory of social memory, through the thematic of the narration, and the invention of fabulous storytelling.