International audienceThis article analyses the mechanisms of production of knowledge in scientific discourses in the Early Modern Age. What ratio, what logic does scientific discourse obey, what are the mechanisms and ways of finding and constructing knowledge in this logos? We will see how in the scientific texts of the Early Modern Age, analogy plays a fundamental role in the production of knowledge and, from there, to what extent we can conceive of a poetics of scientific texts. An analysis of the functioning of analogy in scientific texts reveals that, far from being a mere ornament or stylistic device, analogy works as a source of knowledge, providing a passage from the known to the unknown. Finally, we will examine the implications ...