What here call interpretation is a certain passage, a certain semantic relationship proposed by Foucault between, on the one hand, what Descartes said or what lie is believed to have said or meant and on the other hand, let us say, with intentional vagueness for the moment, a certain historical structure, as it is called, a certain meaningful historical totality, a total historical project through which we think what Descartes said or what he is believed to have said or meant can particularly be demonstrated.