ONE OF the main purposes of science is to show that "the world is intelligible" by human reason. This attempt at a rational comprehension has an history, which is closely linked to that of sciences, but also to that of techniques and of philosophy, and also with scientific creation. We examine the relationship between social construction and historicity, by putting emphasis on the importance of knowledge contents, that do not let themselves be dissolved in the external conditions of their constitution. All the richness of historicity shows itself in the organic way in which these contents are woven from materials of the empirical world assimilated in rational constructions. Historicity itself becomes intelligible to us, and allows us to conceive widenings of rationality that allow opening, invention and progress of knowledge.
Science History; epistemology; rationality