  Contemporary philosophers have devoted considerable attention to Du Bois’s explanation and definition of race in “The Conservation of Races;” indeed, they have given more attention to Du Bois’s definition than to his treatment of any other philosophical issue. Nearly all that attention can be traced to Kwame Anthony Appiah’s engagement with Du Bois in “The Uncompleted Argument: Du Bois and the Illusion of Race” (Appiah, 1985), an expanded version of which Appiah published as the second chapter (“Illusions of Race”) of In My Father’s House (Appiah, 1992).