I hereby propose to show the way communication functioned at Mallarmés Mardis (his Tuesday literary gatherings) during the last period of his life, by comparing them to another two of the devices he imagined for the symbolic realm : first, the ever-unrealised and unceasingly evoked « Livre » (Book) project ; secondly, those of his poems reputed as obscure. The point is to identify the way the Mardis belong to a general strategy of « retrait à caractère participatif » withdrawal characterised by participation, designed to turn both an institutional and an existential profit for the poet and his disciples ; as well as the way Mallarmé, through this strategy, which seems to have been the presiding model for his investment in the literary game, brings to light a modern mode of communication which, paradoxically, functions under the banner of the old motif of that secrecy necessary to its initiatory nature.