 Inferiority of mind and imagination, he adds, is also confirmed, in Jefferson’s estimation, by “the improvement of the blacks in body and mind, in the first instance of their mixture with the whites,” and that “has been observed by every one, and proves that their inferiority is not the effect merely of their condition of life” ([NV]: 141). Here he may be referencing “observations” in scientific texts of his day in his library.