Part 1 of this book deals with the practice of neurology. It comments on neurologic history-taking, including observations of patient gestures. It also discusses the neurologic examination and its quantification. Magnetic resonance and computerized tomographic brain imaging are compared and contrasted. The importance of gravity, timing of scans, and plane of section of scans are emphasized. Neurologic diagnosis and its pitfalls are discussed. Neurologic treatment, empirical approaches to therapy, and the provision of hope and reassurance are emphasized. In Part 2, symmetry in neurologic disease as a clue to metabolic cause is a major topic. Selective vulnerability of brain areas to trauma, anoxia, toxins, and other diseases are discussed. Diseases of rapid normalization including myelinolysis are described. Carotid stenosis, berry aneurysm, arteriovenous malformations and other examples of asymptomatic disease comprise a final chapter in this section. Part 3 comments on special topics in neurology. Major attention is given to neurologic terminology, its origins, evolution, eponyms, and politics. The rise, fall, and evolution of neurologic concepts are described. Consideration is given to classifications and causation in neurology. The phenomena of decussation and asymmetry in neurology are discussed.