Ralph Waldo Emerson's dementia, an ordeal that marked his final two decades, has never been a secret among those who study Emerson's life. Still, few have focused on the period of Emerson's decline. Thus, his later thinking has succumbed to a process of critical forgetting too often ignored by scholars if not excluded from his oeuvre altogether. And yet Emerson's late output, composed as his patterns of cognition transformed profoundly, stages a reconsideration...