 Eventually, Russell supplemented this distinction between direct and indirect knowledge of truths with his equally famous distinction between knowledge by acquaintance and knowledge by description. As Russell explains, “I say that I am acquainted with an object when I have a direct cognitive relation to that object, i.e. when I am directly aware of the object itself. When I speak of a cognitive relation here, I do not mean the sort of relation which constitutes judgment, but the sort which constitutes presentation” (1911, 209). Later, he clarifies this point by adding that acquaintance involves, not knowledge of truths, but knowledge of things (1912a, 44). Thus, while intuitive knowledge and derivative knowledge both involve knowledge of propositions (or truths), knowledge by acquaintance and knowledge by description both involve knowledge of things (or objects). This distinction is slightly complicated by the fact that, even though knowledge by description is in part based upon knowledge of truths, it is still knowledge of things, and not of truths. (I am grateful to Russell Wahl for reminding me of this point.) Since it is things with which we have direct acquaintance that are the least questionable members of our ontology, it is these objects upon which Russell ultimately bases his epistemology.