1. Introduction -- 2. Waterborne Diseases -- 3. Sewers: When, Where, and to What Effect -- 4. Typhoid Mary Meets Jim Crow: Stories from Memphis, Savannah, and Jacksonville -- 5. The Exception That Proves the Rule: Shaw, Mississippi -- 6. Water Filtration: Who Benefitted and Why -- 7. Verification -- 8. Further Tests -- 9. Conclusions -- App. The Negro Mortality Project