Preface; Part I: 1. From the schoolmen to gall; 2. Bouillaud to Broca; 3. Hughlings Jackson; 4. The diagram makers; 5. Marie the iconoclast; 6. Chaos; 7. Historical retrospect; Part II: Introductory; 1. Methods of examination; 2. Clinical examples; 3. The nature of the disturbances of function in aphasia and kindred disorders of speech; 4. Diverse clinical manifestations assumed by these defects of symbolic formulation and expression; 5. The effect produced by the degree of loss of function on the form assumed by an aphasia; 6. The effect produced by disorders of symbolic formulation and expression on various forms of behaviour such as speaking, reading, writing and the use of numbers; 7. Pictures, drawing, visual imagery and music; 8. Summary statement of the results of clinical examination; Part III: 1. What is meant by localisation of function; 2. The anatomical site of the lesion in some traumatic cases of aphasia; 3. General conclusions and summary; Part IV: 1. Vigilance; 2. Cerebral localisation; 3. Language and thinking; 4. Conclusions and summary.