The paper discusses the reception of Locke's achievements. It shows the history of his writings in the British Isles and on the continent. Then it focuses on a number of logic manuals used by the Commission of National Education, especially J. Le Clerc's and A. Genovesi's books. They sought to allay the aversion to logic characteristic of modern Christian Aristotelianism (theory of knowledge, formal logic), as initiated by Descartes, continued by Locke, and radicalized by Condillac. This resulted in a number of eclectic approaches. In accord with the practical position of the Enlightenment, they focused on the useful character of logic, not only in the methodology of the various forms of science of the time (philosophy and the natural sciences that sought to be liberated from its chains). In practical activity, broadly understood, i.e. as the ability to pass judgments or criticize various books, logic was also deemed to be useful.