1. The pre-1860 legacy -- 2. Language localization and the problem of asymmetry -- 3. Left-right polarities of mind and brain -- 4. The post-Broca case for "duality of mind": basic issues and themes -- 5. Left-brain versus right-brain selves and the problem of the corpus callosum -- 6. The "experimental evidence": metalloscopy and hemi-hyponsis -- 7. The Hughlings Jackson perspective -- 8. Freud and Jackson's double brain: the case for a psychoanalytic debt -- 9. The fate of the double brain