Abstract : The memory could constitute the focal point of the mediologic problems. First because it is another name for the transmission, which oppose to the present of communication the depth time of the archive, membership and ritual. Then because the mnemotechnical tools are what makes it possible to identify médiaspheres, i.e. mediums of transmission made by the same system of traces. Finally and especially because the memory is at the same time on the side of culture (traditions and commemorations), and on the side of technique (supports and systems of filing).