  Philosophers interested in Du Bois’s thinking about race in writings he essayed after the publication of “The Conservation of Races” have tended to focus on Dusk of Dawn (1940). In this connection, both Paul Taylor (2000, 2004a, 2004b, and 2014) and Robert Gooding-Williams (2014) have elaborated detailed accounts of the notion of race that Du Bois sketches in the book he subtitled “An Essay Toward an Autobiography of a Race Concept.” In a related vein, Joel Olson (2004), Shannon Sullivan (2006), and Terrance Macmullen (2009) have examined Du Bois’s conceptualization of whiteness, giving particular attention to Dusk of Dawn but also to Du Bois’s earlier works. Olson reads Dusk of Dawn as advancing an argument Du Bois initiates in Black Reconstruction (1935).  Sullivan and Macmullen read it as advancing an argument Du Bois initiates in “The Souls of White Folk” (see Darkwater (1920)).