This article analyses the way in which Piaget links the analogy between the child and the primitive with a theory of the history of the sciences, that is, it analyses Piaget's version of Haeckel's principle in which ontogenesis recapitulates phylogenesis. From this analysis, we reconstitute the operations through which Piaget forms and expresses his conception of logic. In other words, we attempt to reconstruct the characteristic space of Piaget's non-objectivated choices and positions that determines the conception of logic operative in his scientific and epistemological work.