Clinical speech disorders are abundant, but our theoretical knowledge about them is scarce. This volume is an excellent summary of the present state of work in the field. The author, one of Europe's most distinguished neurologists, covers both the esoteric (origin of language) and the practical (anatomy and physiology of language); whatever the topic, the presentation is succinct, stimulating, and at times brilliant. The key to Sir Russell's approach to speech and language is his conviction that physiology is "the link between the anatomy of the brain, in terms of which we describe lesions, and psychology, in terms of which we apprehend speech disorders."