Abstract
Why Tarde is interested by Leibnitz’s monads ? That they come to make in the analysis of the social field ? The concept of monad, be necessary as a refutation of the slowness of the Cartesian mechanism. By vitalism immanent in the nature, the monadology distinguishes itself from any atomism. By considering that « The material is spirit, anything more » Tarde understands that any thing is already a society, showing a social link between the differences which it associates. All is political in the composition of the least particle ; a molecular politics which spatters on the society, to undo the macroscopic forms of power. Where from the idea of one biopower. There are no cuts between technical production and natural generation. The machine which is not reduced in mechanics carries in him ecological affinities