1. Introduction: From irritable heart to soldier's heart -- 2. The United States Civil War: Da Costa at Turner's Lane -- 3. Medical disorders, diseases, statistics and pensions: Civil War -- 4. The Nineteenth-century British soldier, Maclean and Netley -- 5. Symptoms and patient histories: functional versus organic heart disease -- 6. Diagnosis in the nineteenth century -- 7. Pulse and pressure, inventions and instruments, measurements and records -- 8. A new clinical currency: technology, laboratories and books -- 9. Mind and body, brain and heart -- 10. World War I: Mackenzie and Osler -- 11. The military heart hospitals: Thomas Lewis -- 12. Minority opinions from the military heart hospitals: Clifford Allbutt -- 13. Samuel Levine and neurocirculatory asthenia -- 14. Lewis Conner and the examination of 4 million men -- 15. Anglo-American cardiology -- 16. Where are the diseases of yesteryear?.