Introduction : disease histories and race histories -- Toward a historical epidemiology of African American tuberculosis -- The rise of the city and the decline of the Negro : the historical idea of Black tuberculosis and the politics of color and class -- Urban underdevelopment, politics, and the landscape of health -- Establishing boundaries : politics, science, and stigma in the early antituberculosis movement -- Locating African Americans and finding the "lung block" -- The web of surveillance and the emerging politics of public health in Baltimore -- The road to Henryton and the ends of progressivism -- Conclusion : unequal burdens : public health at the intersection of segregation and housing politics.